Historic Markers in Pennsylvania

Harrison Township, PA · est. 1947

In October 1767, the Moravian missionary David Zeisberger made his way through this unbroken wilderness on a journey from Bethlehem toward the Delaware communities of the west. A tireless figure of colonial Pennsylvania, Zeisberger spent decades living among Native peoples and learning their languages. His passage through these primeval forests marked one of the first recorded European crossings of the region.

Allegany Township, PA · est. 1947

In October 1767, Moravian missionary David Zeisberger traveled through this remote stretch of forest, bound from Bethlehem toward the Delaware communities to the west. Renowned for living among Native peoples and mastering their languages, Zeisberger devoted his life to missions on the frontier. His route through this untouched country was among the earliest recorded European journeys across the region.

Coudersport, PA · est. 1916

On an October night in 1767, the Moravian missionary David Zeisberger camped near this spot, guided by two Delaware companions, Anthony and Papunhank, as he journeyed from Bethlehem toward the Allegheny. The trip opened the way for the Moravian missions that would take root among the Delaware across western Pennsylvania and eastern Ohio. Tradition holds him the first European to travel the primeval forests of the upper Allegheny.

Catasauqua, PA · est. 2023

Founded in the iron-rich Lehigh Valley in 1865, the Davies and Thomas Company mastered a demanding new craft: casting the heavy iron plates that line tunnels bored beneath rivers and cities. Its segments went into landmark works of American infrastructure—the Holland and Lincoln tunnels and railroad bores—as well as projects overseas. A sample of its tunnel lining was proudly displayed at the 1904 St. Louis World's Fair.

Avalon, PA · est. 1987

In the decades after the Civil War, the U.S. Army Corps of Engineers set out to tame the Ohio River for year-round navigation. Their first lock and dam on the river, built here between 1878 and 1885, was a marvel of its day—the largest movable dam yet constructed, with the world's first rolling lock gate and its widest lock chamber. It served until 1922, when the nearby Emsworth Locks and Dams replaced it.

Oley Township, PA · est. 1948

In 1745 Dr. George de Benneville built his house in the Oley Valley, a fertile pocket of Berks County settled by German-speaking immigrants. A physician and itinerant preacher, de Benneville carried to America a radical theology of universal salvation, and from this rural corner he became the founder of Universalism in the colonies before his death in Philadelphia in 1793. His ministry took root among the diverse religious communities of colonial Pennsylvania, long a haven for dissenting faiths.

Honesdale, PA · est. 1947

Built between 1825 and 1828, the Delaware & Hudson Canal linked the Hudson and Delaware rivers to move northeastern Pennsylvania's anthracite coal to market. Honesdale served as its western terminus, fed by a gravity railroad reaching back to the mines at Carbondale. For some seventy years the canal was the region's lifeline, floating hard coal toward the cities that its clean heat helped to power.

Tinicum Township, PA · est. 1949

The little canal community once called Mexico took the name Uhlertown from Michael Uhler, a boatbuilder who ran his own line of boats along the Delaware Canal. Lock No. 18 and the tidy buildings clustered around it survive as reminders of the busy waterway era. In the mid-19th century, places like this hummed with the traffic of mule-drawn boats hauling coal and freight.

New Hope, PA · est. 1949

At New Hope the Delaware Canal reveals much of its working machinery, with locks No. 8 through 11 among the twenty-three lift locks that stepped boats along the route. The town also boasted one of the canal's nine aqueducts and the only toll station between Bristol and Easton. Coal was the great cargo, floated south by mule-drawn boats through this bustling river town.

Durham Township, PA · est. 1949

Here at Lock No. 21, one of twenty-three lift locks numbered from Bristol to Easton, the Delaware Canal carried boats over Cooks Creek by aqueduct. The nine aqueducts along the route floated both water and freight across the streams feeding the Delaware River. In the canal's heyday, mule teams plodded the towpath hauling coal and goods through this quiet stretch of Bucks County.

New Hope, PA · est. 1949

Opened from Bristol as far as this point in 1831 and finished to Easton by 1852, the Delaware Canal became one of Pennsylvania's vital freight arteries. An outlet lock built here in 1834 connected the canal to the river itself, and the nearby River House of 1794 served as a favorite stop for barge crews. For decades the canal bustled with boats carrying coal downriver toward Philadelphia and beyond.

Solebury Township, PA · est. 1949

Lock No. 12 marks one of the twenty-three lift locks that carried boats along the Delaware Canal between Bristol and Easton. Just upstream, one of the canal's nine aqueducts lifted the waterway and its traffic across a small stream draining toward the Delaware. In the mid-1800s, mule-drawn boats laden with coal passed through here in steady procession.

Williams Township, PA · est. 1949

Just below the highway runs the channel of the Delaware Canal, the towpath waterway that once carried anthracite coal and freight along the Delaware River. Here stand Locks No. 22 and 23, the final lift locks in the 60-mile run from Bristol up to the Lehigh River at Easton. In the canal era, such locks stepped boats up and down the changing elevations, letting mule-drawn barges move heavy cargo before the railroads took over.

Delaware Township, PA

This memorial stands in the Delaware Cemetery near Dingman's Ferry, a Delaware River hamlet in Pennsylvania's Pike County that grew up around one of the region's early ferry crossings. It was raised in 1982 by American Legion Post No. 851 — part of the veterans' organization chartered by Congress in 1919 in the wake of World War I — whose posts are customarily named for local servicemen, here Tilghman, Angle, and Smith. Rather than marking a single battle or soldier, the stone deliberately gathers 'all veterans' under one dedication, the kind of collective remembrance found in small-town cemeteries across America.

Media, PA · est. 1982

Formed out of Chester County in 1789, Delaware County takes its name from the great river along which William Penn first stepped ashore in Pennsylvania in 1682. The county holds the Old Chester Courthouse of 1724, among the oldest public buildings in the country and a survivor from the colony's founding generation. Its seat, Media, was incorporated in 1850.

North Strabane Township, PA · est. 2009

In the mid-20th century, harness racing—the sport of trotters and pacers pulling a driver in a light two-wheeled sulky—was one of America's most popular pastimes, and few names loomed larger than Delvin Miller. Over an extraordinary career spanning eight decades he won thousands of races and captured the sport's crown jewels, while breeding and training champion horses whose bloodlines shaped the sport for generations. In 1963 he brought the action home to southwestern Pennsylvania by founding The Meadows, cementing the region's place on the racing map.

Loretto, PA · est. 1947

Demetrius Gallitzin was a Russian prince who renounced a life of aristocratic ease to become a Catholic priest on the American frontier, founding the colony of Loretto in 1799. He labored among the settlers of the Allegheny highlands for four decades until his death in 1840, and St. Michael's Church stands on the site of his original chapel. His tomb here honors one of the most unusual missionaries in early American history.

Forty Fort, PA · est. 1972

Built in 1790 in the Wyoming Valley, this house was home to Colonel Nathan Denison, who had served as a Revolutionary War officer during a turbulent era of frontier warfare and land disputes in northeastern Pennsylvania. After independence, Denison became a Luzerne County judge, helping build the civic institutions of the young republic. The home stands as a tangible link between a soldier's wartime service and his later role in ordering a new nation's local government.

Cherrytree Township, PA · est. 2004

In the frenzied years after Colonel Drake's 1859 strike, Pennsylvania's Oil Creek valley became the cradle of the world petroleum industry — but moving crude in leaky wooden barrels by wagon was slow and wasteful. In 1865 brothers James and Amos Densmore mounted two large wooden tanks on a flat railway car at nearby Miller Farm, each holding dozens of barrels, and shipped a successful test load to New York City. The design spread almost overnight, with hundreds in service within a year, and it set the template for the steel tank cars that still carry oil today.

Derry Township, PA · est. 1948

Founded in 1729, Derry Church grew from the Scots-Irish Presbyterian settlement that spread across the Pennsylvania backcountry in the early 1700s. Its first pastor, William Bertram, was installed in 1732 by the Donegal Presbytery, and in 1741 the sons of William Penn patented its wooded grove to the congregation. The surrounding churchyard is remembered as the oldest pioneer graveyard in the region.

Derry Township, PA · est. 1948

This churchyard, the oldest pioneer burial ground in Dauphin County, holds the first generations of the region's Scots-Irish settlers. Among the graves lie the early pastors William Bertram and John Roan, alongside men who fought in the French and Indian Wars and the Revolution. One of them, Col. John Rodgers, put his name to the Hanover Resolves of 1774, an early pledge of resistance to Britain.

Catasauqua, PA · est. 1998

Beginning in 1897, D. George Dery built his first Pennsylvania silk mill here in Catasauqua and rapidly expanded across the state. By 1914 his operation spanned fifteen mills and employed thousands, making him one of the world's largest silk manufacturers during the industry's Pennsylvania heyday. The empire proved fragile, and operations ceased in 1923.

Meadville, PA

In September 1880, Elias Allen tried to enroll his two children at Meadville's South Ward schools and was turned away because of their race. He took his case to the Crawford County Court of Common Pleas, where Judge Pearson Church struck down the 1854 state law that had required separate schools for Black children. The legislature amended the law the next year, ending mandated school segregation across Pennsylvania as of July 4, 1881.

Easttown Township, PA · est. 2015

First held in 1896 as a modest one-day event to showcase fine carriage horses for the Main Line's landed families, the Devon Horse Show grew into the oldest and largest outdoor multibreed competition in the nation. By adding a Country Fair in 1919, it turned its prestige to charity, benefiting Bryn Mawr Hospital. In 2010 it earned the U.S. Equestrian Federation's highest honor as a Heritage Competition.

Philadelphia, PA

In the early 1700s, the countryside northwest of Philadelphia was a patchwork of Quaker and German settlements where faith and industry often shared the same roof. William Dewees opened his home to the Reformed congregation at Whitemarsh, which gathered there for worship across thirty-five years until his death in 1745. Just across the road, around 1710, he built what is remembered as the second paper mill in America—part of the young colony's remarkable early lead in papermaking, a trade that fed the printing presses of a soon-to-be-revolutionary Philadelphia.

Philadelphia, PA · est. 2018

In 1965, years before the Stonewall uprising, activists staged one of the nation's first LGBT sit-ins at Dewey's, a Philadelphia restaurant that had refused to serve gay and gender-nonconforming customers. Directly inspired by the African American lunch-counter sit-ins of the civil rights movement, the demonstrators occupied the counter until Dewey's backed down and dropped its discriminatory policy. It was a small, early, and largely forgotten victory in the long struggle for equal treatment.

Mount Carmel Township, PA

Diamondtown is a small patch community in the anthracite coal country of Northumberland County, where hard-rock mining families sent generations of sons and daughters into the nation's armed forces. This memorial gathers all of them under a single dedication — not to one battle or war, but to everyone from the community who wore the uniform, in combat and in the quieter years of peacetime service. Marble and bronze tributes like this one became the civic heart of Pennsylvania's coal towns, where local identity and national service were tightly bound.

Carlisle, PA · est. 1947

In the hopeful years just after independence, Dr. Benjamin Rush — a signer of the Declaration — imagined a practical, liberal-arts education fit for a self-governing people, and with Col. John Montgomery of Carlisle he founded a college to train future leaders. Chartered on September 9, 1783 and named for John Dickinson, it became the first college established west of the Susquehanna River. The school embodied the founders' belief that a republic could only survive with an educated citizenry.

Carlisle, PA · est. 1949

Founded in 1834 by the jurist John Reed — author of the influential "Pennsylvania Blackstone" — Dickinson School of Law became the oldest law school in Pennsylvania and one of the earliest in the nation. In an era when most lawyers still trained by apprenticeship, a formal school of law was a bold experiment in professional education. Among its early graduates was Andrew Curtin, who would serve as Pennsylvania's Civil War governor.

Williamsport, PA · est. 1996

German-born publisher Dietrick Lamade founded the Sunday Grit in Williamsport in 1882, building it from this site after 1889 into one of the country's best-known "family newspapers." He grew Grit on a deliberate formula: upbeat "good news," content tuned to rural readers, and a nationwide army of young paperboys who sold it door to door. For generations of small-town and farm households, Grit was a weekly window on the wider world.

Birmingham Township, PA · est. 1915

Near the village of Dilworthtown, the Battle of Brandywine drew to its close on the evening of September 11, 1777. After Washington's line was flanked and driven back through the surrounding hills, the last fighting flared here as darkness ended the day. The marker fixes the point where one of the Revolution's largest engagements finally spent itself.

Delaware Township, PA · est. 1948

Long before bridges spanned the Delaware, travelers crossed by ferry, and Dingman's was among the earliest. In 1750 the pioneer settler Andrew Dingman built his own flatboat—shaping it, the marker says, with his own hand axe—to carry people and goods across the river. The crossing became a fixture of the region and gave its name to the settlement that grew up around it.

Gettysburg, PA · est. 1947

The Reverend Alexander Dobbin built this stone house in 1776, the very year of independence, and for some twenty-five years ran within it one of the first classical schools west of the Susquehanna River. Students here read Latin and Greek on a frontier that had only recently been wilderness, evidence of how quickly settlers sought to plant learning in new country. Today the restored house serves as a museum of that early-republic world.

Reading, PA · est. 1951

On this Reading site stood the home of Dr. Jonathan Potts, who served from 1777 to 1780 as Deputy Director General of the Continental Army's Northern and Middle Departments. In an era when battlefield disease killed more soldiers than musket fire, Potts organized the army's overwhelmed medical service during the hardest years of the Revolutionary War.

Independence Township, PA · est. 1947

Around 1773 John Doddridge raised a cluster of stockaded cabins on this frontier, strong enough to shelter neighboring families when danger threatened. Through the Revolutionary years such fortified homesteads were the settlers' refuge from raids along the western border. The place is also remembered as the boyhood home of Dr. Joseph Doddridge, later a noted chronicler of frontier life.

Texas Township, PA · est. 1951

In 1865, as the nation emerged from the Civil War, Alsatian-born glassmaker Christian Dorflinger established works here in Wayne County that would become famous for the clarity of their flint glass. For more than half a century, artisans blew and cut fine tableware on this site, and Dorflinger's crystal graced the tables of a succession of American presidents in the White House. Production continued until 1921.

Pittsburgh, PA · est. 2019

On Pittsburgh's North Side in 1968, community activist Dorothy Mae Richardson refused to watch her neighborhood decline. She founded Neighborhood Housing Services, a pioneering model in which residents themselves—not distant officials—drove the work of rehabilitating homes and reinvesting in their community. Her approach proved so effective that it spread nationwide and led to the creation of NeighborWorks America.

Doylestown, PA · est. 2003

After the Civil War, thousands of midsize metalworking firms powered America's rise as an industrial giant, and the Doylestown Agricultural Works was one of them. Built in 1867, the factory turned out farm machinery and ironwork that reached markets around the world, and for decades it was the area's largest employer. Its later years traced the industry's consolidation — it briefly passed through General Motors' Sampson Tractor Division before closing in 1937.

Philadelphia, PA · est. 2008

In the early 20th century, A. S. W. Rosenbach reigned as the most famous rare-book and manuscript dealer in America, the man great collectors and libraries turned to when they wanted a Shakespeare folio or a founding-era document. With his brother Philip he assembled a personal treasure trove and then gave it a permanent public home as the Rosenbach Museum & Library. The brothers lived on this Philadelphia block for the last quarter century of their lives.

Towanda, PA · est. 2016

In the early twentieth century few women held senior posts in American science, yet Alice Evans built a career as a federal bacteriologist just as germ theory was reshaping public health. Her research traced a dangerous recurring fever in people to bacteria carried in unpasteurized milk, and she spent years pressing a skeptical dairy industry and public toward pasteurization. Her path began here in the Susquehanna Valley, at the collegiate institute where she was educated.

Chester, PA · est. 2019

At the turn of the twentieth century, a woman practicing surgery was a rarity, and prenatal care as we know it barely existed. Dr. Anna E. Broomall, trained at the Woman's Medical College of Pennsylvania, opened what is recognized as the first prenatal care clinic in the United States at the Woman's Hospital in Philadelphia. Her advances in obstetric surgery helped lower the toll that childbirth then took on mothers and infants. She spent her career teaching the next generation of women physicians.

Reading, PA · est. 1951

This was the home of Dr. Bodo Otto, a military surgeon who served the Continental Army from 1775 to 1782. As surgeon-in-chief at Valley Forge during the brutal winter of 1777–78, the aging physician tended troops battling smallpox, exposure, and starvation in the encampment that became a symbol of American endurance.

East Fallowfield Township, PA · est. 2005

Born in the Quaker village of Ercildoun in Chester County, Charlotte Moore Sitterly became one of the leading physicists of her era. A career researcher with the U.S. Bureau of Standards, she authored more than a hundred books and articles and produced authoritative reference tables on the spectra of the sun and other elements. Honored by the American Astronomical Society in 1937, she became the first woman elected to Britain's Royal Astronomical Society in 1949.

Upper Frederick Township, PA · est. 2023

Dr. Chevalier Jackson, a Pittsburgh native, helped build the modern medical fields of laryngology and bronchology, devising lifesaving techniques to retrieve objects accidentally swallowed or inhaled. His crusade against household poisonings helped bring about the 1927 Federal Caustic Poison Act, one of the nation's early consumer-safety laws. He taught at five Philadelphia medical colleges and, at his home Sunrise Mill, designed many of the specialized instruments that carried his methods forward.

Philadelphia, PA · est. 2015

Dr. Constantine Hering, a German-born physician, settled in Philadelphia and became the leading figure in American homeopathy during the 19th century. He helped establish the country's first homeopathic medical society and its first homeopathic medical college, and he authored foundational texts still cited in the field. From a home office on this site he pursued the research and teaching that shaped a major alternative medical movement.

Hamlin Township, PA · est. 2016

In the early twentieth century, federal eradication campaigns nearly wiped out the lobo, the great gray wolf of the American West, as cattle country treated it as vermin. A Pennsylvania physician, Edward McCleery, gathered surviving wolves and bred them at a park near here, determined to save the strain from extinction. His enclosure became an unlikely refuge and an education center where scientists and curious visitors could see the vanishing animal up close.

Easton, PA · est. 1993

Born on this Easton ground, biochemist Florence Siebert overcame the lasting effects of childhood polio to build a pioneering scientific career. In the 1920s she developed a method to make intravenous therapy safe by eliminating the fevers caused by contaminated solutions, and in 1934 she refined the tuberculin skin test into a reliable form. Her purified protein derivative became the international standard for detecting tuberculosis.

Upper Darby, PA · est. 1985

George Smith wore many hats—physician, judge, scientist, and state senator—settling at the Collenbrook estate in 1829. He helped found the Delaware County Institute of Science and wrote its first county history in 1862. As chairman of the Senate's Education Committee, he drafted the landmark 1836 law that created Pennsylvania's first public school code.

Washington Township, PA · est. 1947

Dr. Henry Harbaugh (1817–1867), born a mile and a half from here, became a leading voice of Pennsylvania-German culture as an author, theologian, and educator. He wrote hymns and poetry in the Pennsylvania Dutch dialect, helping preserve a folk tradition that might otherwise have faded, and taught in the German Reformed church. A monument marks the house where his life began.

Ashland, PA

In 1937, the anthracite-coal borough of Ashland honored Dr. J. L. Hoffman by naming a thoroughfare for his long, unpaid service in municipal affairs. Christening a public boulevard for a local physician-civic leader was a common way early-twentieth-century towns thanked the people who built and ran their institutions.

Milton, PA · est. 2017

Born in Milton in 1815, Dr. James Curtis Hepburn trained as a physician and served as a Presbyterian missionary in Japan during the second half of the 19th century, as that country was opening to the wider world. He compiled the first English-Japanese dictionary, translated the Bible into Japanese, introduced Western medicine, and helped found Meiji Gakuin University. His system for writing Japanese in the Latin alphabet, the Hepburn romanization, remains the most widely used method today.

Canonsburg, PA · est. 2017

When the Civil War began, battlefield medicine was a chaos of scattered wounded and improvised care. Jonathan Letterman, a career Army surgeon raised in Canonsburg, rebuilt it from the ground up: a tiered system of triage, dedicated ambulance and supply wagons, and an orderly chain to move the injured from the firing line to the rear. At Gettysburg his methods treated the wounded of both armies, and the framework he devised became the backbone of modern military medical evacuation.

East Carroll Township, PA · est. 1959

Born on a farm about 400 yards east of the highway, Dr. Lawrence F. Flick became a pioneer in the fight against tuberculosis, then one of the deadliest diseases in America. He was among the first to recognize that the illness was communicable, organized the first American tuberculosis society in 1892, and founded the White Haven Sanatorium in 1901. His work helped move TB care toward fresh-air treatment and public-health prevention.

Philadelphia, PA · est. 2001

Dr. Mary Davis Ridgway was a homeopathic physician and surgeon who moved between the operating room and the fight for women's rights in early 20th-century Philadelphia. In 1913 she chartered Providence General Hospital, an institution whose principal officers were women, and for several years it served the surrounding community. Political pressure eventually forced the hospital from its home, and it closed not long after Ridgway's death in 1927.

Philadelphia, PA · est. 2021

In the early 20th century, a small circle of Black students at Howard University founded Omega Psi Phi in 1911 — the first fraternity established at a historically Black college or university — and Dr. Oscar James Cooper was among them. He carried that founding energy home to Philadelphia, where he practiced medicine for half a century and helped launch the Pyramid Club, a hub of Black professional and cultural life. The house here served as both his residence and his medical office, anchoring him in the community he served.

Upper Providence Township, PA · est. 1994

For a quarter century this Delaware County house was home to Philip Jaisohn, who arrived as a political exile and became the first Korean to earn a Western medical degree and take U.S. citizenship. From abroad he championed democracy in his homeland, founding Korea's first modern newspaper and helping ordinary Koreans read their own written language. Through the long Japanese occupation and into the postwar years, he worked tirelessly for Korean independence and self-government.

Clymer, PA · est. 2007

Dr. Robert Mitchell of Indiana County was an outspoken abolitionist who, in September 1845, sheltered five people fleeing slavery on his property here. When bounty hunters raided, two escaped but three were dragged back into bondage—and Mitchell was tried, convicted, and financially ruined for violating the Fugitive Slave Act of 1793. His case fed the national controversy that hardened into the harsher Fugitive Slave Act of 1850.

Brookville, PA · est. 2018

In the decades after the Civil War, American medical schools faced a grim shortage of cadavers for anatomical study, and the gap was filled by grave robbers who plundered fresh burials—a scandal that horrified the public. Dr. William J. McKnight of Brookville, a country physician who rose to the state senate, helped craft Pennsylvania's 1883 Anatomy Act, which created a board to lawfully distribute unclaimed bodies to medical colleges. The law made body-snatching a crime while giving future doctors a legitimate way to learn their trade.

Union Township, PA · est. 1946

On a wooded flat near Titusville in 1859, Edwin Drake gambled on a radical idea: drilling for oil the way one drilled for water or salt. When his well struck oil that August, it proved petroleum could be produced in quantity, and a scramble of derricks and boomtowns soon filled the Oil Creek valley. The state now preserves the site with a park and museum on the ground where the modern oil age began.

Cherrytree Township, PA · est. 1948

On this Venango County ground in August 1859, Edwin Drake's crew struck oil with a purpose-drilled well, proving that petroleum could be pumped from the earth in quantity. The gusher of interest that followed transformed the quiet creek valleys of northwestern Pennsylvania into the world's first oil boomtowns almost overnight. "Colonel" was an honorary flourish, but the industry Drake helped launch was entirely real and world-changing.