HistoricSiteMarkers

Industry & Invention

Mills, factories, and the machines that changed America.

4,995 markers in this collection — showing 2,8812,940.

Mineral Springs

Meigs Township, OH

Promoted for its medicinal springs by Charles Matheny beginning in 1840, this Adams County spot blossomed into the health resort of Sodaville after its first hotel rose in 1864. Under a succession of owners it drew visitors seeking the curative waters until its main hotel burned in 1924, part of the great 19th-century American vogue for "taking the waters."

Minquas' Path

Rose Valley, PA · est. 1947

Long before roads crossed this part of Pennsylvania, an Indian trading path ran west from the Delaware to the country of the Susquehannock — called Minquas by the Dutch and Swedes — and forded Ridley Creek near this spot. Along it moved one of the most valuable commodities of the seventeenth-century Atlantic world: beaver pelts, carried east by the thousands each year to the small Dutch and Swedish trading posts on the Delaware. This single artery tied the fur-rich interior to a global market hungry for felt hats, and helped decide which European power would prosper on the river.

Mint Museum of Art (Former U.S. Branch Mint)

Charlotte, NC

This building began life as a branch of the United States Mint, striking coins from 1837 to 1861 to serve the Carolina gold rush that had made the region the nation's leading source of gold. After the mint closed, the structure was moved to this site and reopened in 1936 as North Carolina's first art museum, later expanding in 1968 and 1985. Its walls hold both a chapter of American finance and a century of art.

Miss Lillie Dobie's House

Wimberley, TX

Lillie Josephine Wagner married John Richard Dobie Jr. in 1901, and the couple bought this Wimberley land in 1911 to run a dairy. After the first house burned, John built the craftsman-style cottage and garage in 1920, and Lillie delivered milk to the community in her Model A Ford. She kept the home until her death in 1971; a century on, the little house with its exposed rafter ends and original beadboard survives as a village store.

Mission Espiritu Santo Cattle Ranch

Victoria, TX

Traditionally called the first great cattle ranch in Texas, Espíritu Santo traces to a 1722 Spanish mission that moved to this stretch of the Guadalupe River in 1726—giving Mission Valley its name. The mission's ranching operation swelled to an estimated 40,000 head and helped shape the famed Texas longhorn, and after secularization the land passed through Spanish and Mexican grants to owners like Quincy Davidson, who by 1878 controlled nearly all the cattle in Victoria County. Operated continuously since the eighteenth century, the ranch and the ruins of its mission preserve a deep record of Spanish colonial Texas.

Mission San Francisco de la Espada Dam, Ditch and Aqueduct

San Antonio, TX

To make Mission Espada permanent, Franciscan missionaries and their Indian laborers built a dam, irrigation ditch, and aqueduct on the San Antonio River between about 1740 and 1745. The 270-foot dam curved "the wrong way" yet held, and the aqueduct — where tradition says goat's milk was mixed into the mortar — carried water over Piedras Creek to fields of maize, beans, melons, and cotton. Surviving floods, raids, and secularization, the works were repaired in 1895, saved by the San Antonio Conservation Society in 1941, and named a National Historic Landmark in 1965.

Missouri Mines State Historic Site

Park Hills, MO

Missouri's Old Lead Belt made the state one of the world's leading sources of lead, and the St. Joe Lead Company's mills processed ore that armed the nation and wired its growing cities. Federal Mill No. 3, with its towering headframe and cluster of mill buildings, survives as a rare intact monument to that industrial era. For generations, lead mining shaped the towns, jobs, and landscape of southeastern Missouri.

Missouri River Bridges of South Dakota

Chamberlain Township, SD

Completed in 1927 and commemorated as a National Historic Civil Engineering Landmark in 1993, the Missouri River bridges of South Dakota were an ambitious feat of early-20th-century engineering, spanning the wide, powerful river that had long divided the state's east and west. Recognized by the American Society of Civil Engineers, they represent the era when automobile roads and steel spans finally tamed one of the continent's mightiest waterways for everyday travel.

Missouri-Kansas-Texas Railroad

Denison, TX

Incorporated in 1865, the line that became the Missouri, Kansas & Texas Railroad—universally known as "The Katy"—was the first railroad to cross Indian Territory and enter Texas from the north. Following an old cattle trail, it steamed into the brand-new town of Denison on Christmas Day 1872, named for a Katy vice-president. Branch lines soon fanned out across the state, and by 1904 the Katy ran more than a thousand miles of Texas track, hauling cattle, cotton, and passengers on trains like the "Texas Special."

Missouri, Kansas & Texas (Katy) Railroad Bridge

Belton, TX

When the Gulf, Colorado & Santa Fe Railroad bypassed Belton in 1881, townspeople refused to be left off the map and arranged for a spur into the city. The Katy Railroad arrived in 1882, bridging the Leon River and turning Belton into a shipping hub for Central Texas cotton growers. Around 1900 the line replaced its earlier wooden trestles with this riveted-steel Parker truss, a workmanlike specimen of early 20th-century bridge engineering still standing over the river.

Mistrot-Adoue House

Calvert, TX

Built in the 1870s by either Henry B. Mistrot or Bertrand Adoue—business partners linked through Adoue's brother Jacques—this two-story Calvert residence blends Greek Revival and Victorian styling, its French owners' heritage reflected in fleur-de-lis patterns worked into the woodwork. The prominent businessman Jacques Adoue bought the home in 1888, and it remained in his family until 1977. It was named a Recorded Texas Historic Landmark in 1980.

Mitchell-Schoonover Home

Fort Worth, TX

Jeweler James E. Mitchell insisted on exacting craftsmanship when he built this home, completed in 1907 to the design of the noted Fort Worth firm Sanguinet and Staats. It passed in 1920 to his friend Dr. Charles B. Simmons and later to Simmons's daughter Maurine and her husband, Dr. Frank Schoonover, who lived there into 1979. The house reflects the polish of Fort Worth's professional class in a booming cattle-and-railroad city.

Moe's Books

Berkeley, CA

In 1959, Morris "Moe" Moskowitz and his wife Barbara opened a small paperback shop that grew, after moving to Telegraph Avenue, into one of the country's great used-book emporiums, stocked with hundreds of thousands of volumes. Moe pioneered a fair, transparent trade policy — cash or credit in his famous "Moe Dollars" — that treated secondhand books with respect. A cigar-smoking, unabashedly leftist iconoclast, Moe embodied the anti-authoritarian spirit of Berkeley's Telegraph Avenue.

Mojave 20-Mule-Team Borax Terminus

Kern County, CA · est. 1958

From 1884 to 1889 this spot near Mojave was the Southern Pacific railroad terminus for the legendary twenty-mule-team borax wagons, which hauled ore 165 miles across mountain and desert from the Harmony Borax Works in Death Valley. Designed by company superintendent J.W.S. Perry and built in Mojave, each wagon train carried a twenty-four-ton payload on a round trip that took twenty grueling days. New borax discoveries near Barstow ended the Mojave route in 1889.

Molly Maguire Executions

Jim Thorpe, PA · est. 2006

On June 21, 1877, four men accused of belonging to the "Molly Maguires," an alleged secret society of Irish miners, were hanged here in what came to be called the Day of the Rope. Their convictions rested largely on the undercover testimony of Pinkerton detective James McParlan, hired by coal interests. More than a century later, historians still debate the truth of the labor, class, and ethnic conflicts that drove the case, and even whether the organization truly existed.

Molly Maguire Executions

Pottsville, PA · est. 2006

On June 21, 1877—a day remembered in the anthracite region as 'Black Thursday'—six Irish immigrant mineworkers accused of belonging to the secret society known as the Molly Maguires were hanged here, with four more executed the same day at Mauch Chunk. The convictions rested largely on the testimony of Pinkerton detective James McParlan, who had infiltrated the coalfields on behalf of powerful mining and railroad interests. To this day historians debate the guilt of the accused, the fairness of the trials, and even whether the organization truly existed.

Monogahela River Navigation System

Forward Township, PA · est. 2012

Begun in 1838, the Monongahela River's system of locks and dams became one of the nation's earliest and most successful efforts to tame a river for year-round travel and trade between Pittsburgh and Fairmont, West Virginia. Millions of tons of coal moved through its locks to feed Pennsylvania's mighty coke, iron, and steel industries. After the federal government acquired the system in 1897, the Army Corps of Engineers expanded and modernized it for generations to come.

Monroe-Crook House

Crockett, TX

The Monroe-Crook House was built in 1854 by A. T. Monroe, a prominent merchant and grandnephew of President James Monroe, in a refined Greek Revival style with insulating brick set between its inner and outer walls. Attorney George W. Crook bought the home in 1911, and it has since been preserved by his family. It was recorded as a Texas Historic Landmark in 1969.

Montague County Poor Farm

Montague, TX

In 1888 Montague County established a poor farm east of town, renting land to an operator who housed and fed the needy in exchange for their labor; its first year listed sixteen paupers. Moved to a larger tract in 1899, it grew a "big house" for residents and, by the 1930s, hosted a WPA garment project and a Texas A&M horticultural research station. The county closed the institution in December 1939 after more than fifty years of caring for its poor.

Monte Vista Historic District

San Antonio, TX

Monte Vista rose between 1890 and 1930 as one of San Antonio's fashionable suburbs, where brewery presidents, oilmen, cattle barons, and civic leaders built showcase homes. Its streets hold an eclectic mix of Georgian, Renaissance Revival, Mediterranean, Victorian, and Art Deco designs, some by noted architects such as courthouse designer J. Riely Gordon and Atlee B. Ayres. The district survives as a colorful record of the city's turn-of-the-century growth.

Monterey Customhouse

Monterey, CA

Raised in stages between 1827 and 1841, this Custom House collected duties on foreign shipping when Monterey served as the capital of Mexican Alta California. Those customs receipts were the province's chief source of revenue, making the building the commercial heart of a distant frontier of the Mexican republic. Its adobe walls witnessed the busy trade in hides, tallow, and manufactured goods that tied California to the wider Pacific world.

Montgomery County Courthouses

Conroe, TX

Montgomery County was the third county created by the Republic of Texas, established by act of Congress on December 14, 1837, in response to a settlers' petition, and its sprawling original boundaries later gave rise to several neighboring counties. The town of Montgomery served as the first seat, where log cabins and a wood building housed county government until 1889, when an election moved the seat to Conroe. A brick courthouse rose here in 1891, and the present Art Deco building was completed in 1936 amid the prosperity of the Conroe oil boom, later expanded as the county grew.

Montgomery Ward Building

Plainview, TX

Built in 1929 on the eve of the Great Depression, this Plainview store housed Montgomery Ward for nearly four decades. Its glazed terra cotta and multicolored tile — a signature look the mail-order giant repeated across its Texas stores — brought big-city retail style to the High Plains. The building endures as a landmark of the town's early commercial growth.

Monticello Missionary Baptist Church

Mount Pleasant, TX

The community of Monticello, named for Thomas Jefferson's Virginia home, took shape in the 1850s and won a post office in 1857, growing into a small hub of mills, gins, a brick factory and a school. Its Baptist congregation appears in association records by 1878 and in 1919 moved to this site, where members donated pine trees, hauled the logs by mule wagon to a local mill, and raised a cross-gabled frame sanctuary in just three months. The church long served as the community's spiritual and social heart, and by the 21st century, as lignite mining and recreational lakes reshaped the land, it stood as one of Monticello's last historic landmarks.

Montour County

Danville, PA · est. 1982

Carved from Columbia County in 1850, Montour County took its name from Madame Montour, the influential Native interpreter and diplomat who moved between Indigenous nations and colonial officials. In the industrial age its seat, Danville, became a cradle of American iron, where the first iron T-rails for the nation's booming railroads were manufactured. The county also claims Christopher Sholes, born here, whose later work produced the typewriter that transformed the modern office.

Monument of Ezra Cornell

City of Ithaca, NY

In the heart of Ithaca, New York, this monument honors Ezra Cornell (1807–1874), the self-made businessman who rose from carpenter and millwright to a key figure in the telegraph industry, helping build the lines that knitted the young nation together. Having amassed a fortune through Western Union, Cornell devoted his wealth to public good, most famously by founding a university in 1865 on the hills above Cayuga Lake. His vision was a radically open institution where, in his own words, "any person can find instruction in any study."

Mooncrest

Carnegie, PA · est. 2004

In 1943, with the nation's factories running full-tilt for the war, the federal government threw up planned housing like Mooncrest to shelter the workers who kept the arsenal fed. Its residents crossed the river to the Dravo Corporation, turning out armor plate, munitions, and ships for the fight overseas. After the war the Air Force ran the community briefly before the little homes passed into private hands in the 1950s.

Moonshine Hill

Humble, TX

After decades of reported gas seeps near the San Jacinto River, the Higgins Oil Company brought in a major gas well in 1904 and the first oil well followed in 1905, opening the great Humble oil field. A boom town called Moonshine Hill exploded to some 10,000 people almost overnight, its tents mixed with a church, school, stores, and saloons. Among its operators was the Moonshine Oil Company of Walter Sharp, Ed Prather, and Howard R. Hughes; despite later booms, the settlement faded away.

Moore County

Dumas, TX

Carved from the Bexar Land District in 1876 and formally organized in 1892, Moore County took its name from Edwin W. Moore, commodore of the Republic of Texas navy. In its early days stagecoaches and freight wagons crossed a thinly settled Panhandle where ranching was nearly the only livelihood. That changed sharply after oil and gas were struck in 1926, and the county's economy grew into petrochemicals, helium, cattle feeding, and grain.

Moore House

Rockport, TX

Built in 1906 for business owner J. Ed Moore and his wife Josephine Kennedy Moore, this story-and-a-half Craftsman bungalow reflects the comfortable domestic style of an early Rockport leader. Moore served several terms as mayor between the 1920s and 1940s and championed civic works—a yacht basin, a public beach park, and a modern sewer system—still felt in the coastal town today. The house's low overhanging roof, wrapped porch, squared columns, and dormer with tripartite windows mark it as a fine example of the period.

Moore House

Seguin, TX

John Moore, an Irish-born newspaperman and civic leader, settled in Seguin and, through family ties, counted Theodore Roosevelt among his friends. In 1895 he built a modest three-room house here, then in 1900 commissioned a fine Queen Anne residence that wrapped the earlier structure inside it. His descendants carried on, including a son who served as Seguin's mayor for twenty-two years.

Moore's Crossing Bridge

Austin, TX

These iron spans began life in 1884 as part of a six-span bridge carrying Congress Avenue across the Colorado River in Austin, engineered by the King Iron Bridge and Manufacturing Co. of Cleveland. Dismantled in 1910 and stored, three spans were re-erected here in 1915 only to be swept away by a flood that same year. The surviving spans were finally rebuilt into the present bridge in 1922.

Moorhead Cable Tool Rig

Kermit, TX

This wooden cable-tool rig was the last of its kind in the United States to retire from daily use, its bull wheels and rig irons of a type not manufactured since the 1920s. It drilled the Moorhead No. 1 well in Loving County, powered first by steam, then by a gasoline engine that ran its 'Yo-Yo' wheels and walking beam, before the well went electric in 1966. That year R. O. Moorhead gave it to Kermit as a Permian Basin oil-history exhibit, moved 35 miles fully intact.

Moran

Moran, TX

Settlers reached this rugged West Texas country in the 1860s and, during the Civil War, built the temporary fortress settlement of Mugginsville on Deep Creek for protection. A branch of the western cattle trail once passed nearby, but the town truly took shape after the Texas Central Railroad arrived in 1881; Swope Hull opened a store and the 'Hulltown' post office in 1883, and the community was renamed Moran in 1892 for a railroad president. Incorporated in 1919, it boomed as a supply point during the oil and gas rush of 1910–30.

Moravia General Store

Hallettsville, TX

Czech immigrants Ignac Jalufka and Jakob Hollub brought their families to northern Lavaca County in 1874, and the community they founded in 1881 was named Moravia after their homeland. In 1889 Jalufka raised a two-story frame building here—groceries and a saloon below, a dance hall above—that became the community's social hub for masquerades and celebrations, while he also ran the post office. Passing through several owners and surviving prohibition, the trimmed-down general store stayed in business over a century, closing in 1990 before reopening in 1996.

Morehead House

Frankfort, KY

Built in 1810 by land-office registrar Mark Hardin, this Frankfort house sheltered a remarkable run of prominent Kentuckians across the 19th century, including bank president John Harvie and Governor Charles S. Morehead, who lived here in the years before the Civil War. After 1874 it passed to merchant and railroad builder Lawrence Tobin, whose family kept it for nearly nine decades. Its walls trace the rise of Kentucky's political and commercial elite.

Morewood Massacre

East Huntingdon Township, PA · est. 2000

In the spring of 1891, the coke fields of southwestern Pennsylvania erupted as some 16,000 workers walked off the job demanding higher wages. On April 2, sheriff's deputies opened fire on strikers at the H.C. Frick Coke Company's Morewood Mines, killing seven that day and two more later; thousands filled the roads to mourn the men buried together in Scottdale. By late May the strike had broken, dealing a hard setback to the fledgling effort to organize the region's coke workers.

Morgan G. Sanders

Ben Wheeler, TX

Born near Ben Wheeler, Morgan Gurley Sanders published newspapers and clerked for the state senate before building a long career in Texas and national politics. A Democrat, he served in the state legislature, as county and district attorney, and for nearly two decades in the U.S. Congress, where Speaker John Nance Garner placed him on the powerful Ways and Means Committee in 1931. Defeated in 1938, he remained an active figure in Van Zandt County until his death.

Morgan Hospital

Childress, TX

When Childress was still a young Panhandle railroad town, its residents depended on a handful of pioneering physicians for care. Built in 1916, this double-galleried Colonial Revival building first housed the clinic of Drs. J.D. Michie and H.D. Barnes before Dr. T.M. Morgan bought it in 1925 and ran it as the Morgan Hospital until he died in 1941. It stands as a memory of the small-town doctors who delivered medicine on the early Texas frontier.

Morgan Steamship Line

Cuero, TX

Charles Morgan launched the first mail and passenger steamship service between the United States and Texas, putting the Columbia on the New Orleans–to–Galveston run in 1835 and soon operating cargo and mail lines all along the coast and to Mexico. From his base at Indianola his ships carried cotton, sugar, army supplies for frontier forts, and even loads of Mexican gold and silver bound for the U.S. mints. After the Civil War he expanded into railroads and dug the Houston Ship Channel in 1875, before the line passed to Southern Pacific in 1883.

Moritz-Hitzfeld-Jacoby House

Fredericksburg, TX

Built in 1907 for newlyweds Edmund and Anna Moritz, this Fredericksburg house was raised from limestone quarried by the Moritz family and finished with the help of Anna's father, carpenter John Metzger, Sr. Its late-Victorian styling blended with Germanic building traditions, including the characteristic use of native stone. Passing to the Hitzfeld family in 1914 and the Jacobys in 1941, it links three of the town's founding German families.

Mormon Settlers in Bandera County

Bandera, TX

In March 1854 a band of Latter-day Saints led by church elder Lyman Wight settled near the year-old town of Bandera on the Medina River. Wight had broken with Brigham Young and brought a colony of 250 to Texas in 1846, moving from Austin to Fredericksburg—where they ran grist and saw mills—before founding "Mormon Camp." Here they raised houses with gardens between them, milled grain, and crafted native-wood furniture to sell back East. When Wight died in 1858 the colony scattered, though a remnant stayed on in Bandera.

Morrie Silver

City of Rochester, NY

When the St. Louis Cardinals moved to sell off their minor-league affiliate in 1957, Rochester's beloved Red Wings franchise was at risk of leaving town. Morrie Silver answered by spearheading a community stock drive, and along with 8,221 fellow Rochesterians he bought shares to keep the team locally owned. This grassroots rescue made the Red Wings one of baseball's pioneering community-owned ballclubs, and the city honored Silver's leadership with this tribute.

Morrill Orchard Company

Alto, TX

In 1901 Michigan peach farmer Roland Morrill and partner W. W. McFarland came to Cherokee County to plant a large commercial orchard beside a rail line, founding the Morrill Orchard Company. A company town of school, commissary, post office, and worker housing grew up around it. The Panic of 1907 and a 1914 blight killed the peach trees, and though the firm limped on with other produce, the crash of 1929 finished it, leaving only the superintendent's house as a marker of its brief prosperity.

Morris Sheppard Dam and Possum Kingdom Lake

Graford, TX

Built in response to devastating Brazos River floods, Morris Sheppard Dam was an early Texas experiment in flood control, water conservation, and hydroelectric power. The federal government financed much of the three-year, $8.5 million project through the Depression-era Works Progress Administration, completing the 2,740-foot dam in 1941. Its reservoir, Possum Kingdom Lake, drowned bridges, roads, and an entire town but later blossomed into a recreation destination after World War II.

Morris-Booz-White House

Port Arthur, TX

Built in 1915 for Dr. Harvey D. Morris, this Port Arthur home later sheltered the Booz and White families and gained its grand wraparound porch and paired-Ionic portico in a 1920s remodeling. Standing along fashionable Lakeshore Drive, it typifies the stately residences that rose as the Gulf port city prospered in the early 20th century. Its architecture reflects the cosmopolitan ambitions of a booming oil-era town.

Morrison Funeral Home

Graham, TX

Mississippi native John Edward Morrison brought his family to Young County in 1876 and opened a blacksmith shop on the town square, steadily building an empire of grocery, dry goods, hardware, and lumber stores. In 1888 he added undertaking supplies to his inventory, giving rise to the Morrison Funeral Home. Passed to his son Adger and later descendants, the business has now served Graham for more than a century.

Morse Block

Berkeley, CA

Designed in 1906 by Charles Dickey — architect of the Claremont Hotel — the Morse Block set two floors of apartments above ground-floor shops. From 1921 to 1935 it housed Donogh Drygoods, a leading downtown "daylight store" lit by windows and skylights, run in part by Mrs. Donogh, one of MIT's first women graduates, who introduced California's first "Basement Grocerteria." The buff-brick, classically detailed upper floors remain original.

Mosaic, Marc Andreessen, and Eric J. Bina

Urbana, IL

In 1993, two developers at the University of Illinois's National Center for Supercomputing Applications released Mosaic, the first browser to weave images and text into a single point-and-click window onto the young World Wide Web. Before Mosaic, the internet was largely the domain of specialists typing commands; afterward, anyone could wander it. The graphical browser it pioneered became the template for every web experience that followed.

Moscow, Camden & San Augustine Railroad

Camden, TX

Chartered in 1898 by lumberman W. T. Carter, the Moscow, Camden & San Augustine Railroad linked the sawmill town of Camden to the main line at Moscow along just seven miles of track. It became Texas's shortest mixed-train railroad, carrying both passengers and freight behind a single engine. One of its retired engines, "Panama No. 201," had helped build the Panama Canal in 1914 before serving here.

Moses Austin

Austin, TX

A Connecticut native who became a leading figure in the American lead industry, Moses Austin carried his ventures from Virginia into the Mississippi Valley and on to Spanish Texas. In 1820 he reached San Antonio de Bexar and, with the help of Baron de Bastrop, won Governor Antonio Martinez's permission to settle 300 Anglo-American families in the province. Austin died in 1821 soon after learning his petition had been granted, and his son Stephen F. Austin carried out his dying wish by leading the "Old 300" into Texas.

Mosty Brothers Nursery

Center Point, TX

The son of Belgian immigrants, Leander A. Mosty came to sparsely treed Kerr County in the 1890s and bet that Hill Country settlers would want fruit and pecan trees. From an 1898 orchard along the Guadalupe River his family built one of the Southwest's largest wholesale nurseries, breeding cling and freestone peaches and pecans that still bear the Mosty name. His sons helped organize the Texas nurserymen's association and supplied plants for the 1936 Texas Centennial grounds in Dallas.

Mother Jones (1830-1930)

Philadelphia, PA · est. 1994

In July 1903, the Irish-born labor organizer Mary Harris "Mother" Jones launched her famous March of the Mill Children from Philadelphia, leading textile workers and children maimed by factory machinery on a long walk to dramatize the toll of child labor. A fearless presence in the coal, steel, and textile struggles, she made the nation look at the young hands turning its looms. Her march helped push child-labor reform onto the American conscience.

Mother Jones Monument

Macoupin County, IL

This monument marks the resting place of Mary Harris "Mother" Jones, the fearless Irish-born labor organizer who spent her long life rallying coal miners and their families against brutal working conditions. She asked to be buried among the miners of Mount Olive at the Union Miners Cemetery, alongside men like "General" Alexander Bradley who led marches of striking workers. By the time she died at 100, she had become the enduring face of American labor's fighting spirit.

Mound House

Lyon County, NV

Mound House started in 1871 as a modest wood-and-water stop on the Virginia and Truckee Railroad, gaining a post office in 1877. It came into its own in 1880 when the V&T launched the narrow-gauge Carson & Colorado toward the mining camps of western Nevada and the Owens Valley, turning the junction into a bustling shipping point; from 1900 to 1920 nearby gypsum mines and mills produced plaster. Once the narrow gauge was pulled back in 1934 and the V&T lifted in 1938, Mound House swiftly faded away.

Mount Joy Cemetery

Cooper, TX

In the days of the Republic of Texas, settlers put down roots at Mount Joy, and by the 1880s it had grown into a bustling farming hub with steam-powered cotton gins, a gristmill, and stagecoach links to neighboring towns. Churches and the cemetery anchored the community, whose first recorded burial dates to 1873. When the post office closed and commerce moved on, the town faded, but its cemetery endures as a record of the families who built it.

Mount Marion Cemetery

Strawn, TX

This cemetery sits on land once owned by coal operator William W. Johnson—whose mining ventures built up nearby Thurber—and takes its name from his daughter Marion, who died at age three. With its earliest documented burial in 1883, it became the main graveyard for Strawn, holding pioneers, town founder Stephen B. Strawn, former Texas Rangers, veterans from the Civil War through World War II, and victims of the 1918–19 influenza epidemic.

Mount Wilson Trail

Sierra Madre, CA

Benjamin 'Don Benito' Wilson cut this trail up the San Gabriel Mountains in 1864 to bring down timber for his ranch. A quarter-century later, in 1889, pack burros hauled a telescope and building materials up the same path to help establish the first Mount Wilson observatory under Harvard College. What began as a logging route thus became a lifeline for early American astronomy, and it remains beloved by hikers of Sierra Madre.

Mountain Home

Rusk, TX

At the homestead called Mountain Home, James Stephen Hogg was born in 1851 to Lucanda and Joseph Lewis Hogg. He grew up to become the first native-born Texan to serve as governor and a champion of reform, driving passage of the Railroad Commission Law and measures like the Stock and Bond and Alien Land laws to curb corporate and speculative power. His governorship marked Texas's entry into the Progressive Era's fight to regulate railroads and big business.

Mounts House

Denton, TX

Robert Noble Mounts and his wife Nannie built this Queen Anne home in 1898 on land that had been part of the family's Denton County farm, settled after his father relocated the family mercantile to the county seat in 1857. His mother Mattie founded Denton's first Sunday school and first kindergarten. Robert himself became a leading cattleman—managing the vast Gregg Ranch and later owning an 84,000-acre spread near Hereford—helping open Texas cattle markets to the north.