24 markers in the database.
Washington, DC · est. 1947
On June 3, 1880, Alexander Graham Bell transmitted speech through the air on a beam of light—not a wire—using his newly invented 'photophone,' sending a wireless voice message from the top of this building to a receiver blocks away. Bell considered the photophone among his most important inventions, though the world was not yet ready to use light for communication. The plaque was placed in 1947 to mark the centennial of his birth.
Washington, DC
Standing near the Ellipse just south of the White House, the Boy Scout Memorial honors the founding and enduring mission of the Boy Scouts of America, which was chartered in 1910. Dedicated in 1964, the bronze grouping depicts a uniformed scout flanked by allegorical figures representing the ideals and traditions that guide him. The inscription reproduces the Scout Oath, the pledge every scout recites as a promise of duty, service, and personal character.
Washington, DC · est. 1950
Around 1828, under architect Charles Bulfinch, two small gate houses were raised at the west entrance to the United States Capitol grounds. The structure marked here stood until 1874; its mate now stands near 15th Street and Constitution Avenue.
Washington, DC · est. 1950
Around 1828, architect Charles Bulfinch—then completing the United States Capitol—oversaw construction of a pair of small gate houses guarding the western entrance to the Capitol grounds. The structure marked here stood until 1874; its companion survives today near 17th Street and Constitution Avenue.
Washington, DC · est. 1928
Built around 1835, this small stone dwelling housed the keeper of the eastern terminus of the Chesapeake and Ohio Canal, where the waterway met Tiber Creek and the Potomac near the growing capital. In the canal era, lock keepers collected tolls and worked the gates that floated boats laden with coal and goods toward Washington.
Washington, DC
From 1857 to 1959, this Washington, D.C. ground held the Columbian Harmony Cemetery, one of the capital's important burial places for African American citizens during an era when segregation extended even to the grave. Founded by a Black mutual-aid society, it became the resting place of many distinguished members of the city's Black community across more than a century. In 1959 the cemetery was closed and its occupants reinterred at the new National Harmony Memorial Park in Landover, Maryland, as the land was redeveloped.
Washington, DC · est. 1907
In the spring of 1755, at the height of the French and Indian War, a division of British regulars under General Edward Braddock set out along this road toward Fort Duquesne, deep in the contested Ohio country. The campaign ended in a disastrous ambush that killed Braddock and scattered his army, an early lesson in frontier warfare witnessed by a young aide named George Washington. The Society of Colonial Wars set this memorial in 1907 to mark the historic route.
Washington, DC
When the Civil War erupted, Washington, D.C., sat dangerously close to Confederate territory, and the Union scrambled to ring the capital with earthwork forts. Fort Bunker Hill was one of these defenses, thrown up in the fall of 1861 on high ground in the city's northeast. Armed with thirteen guns and mortars, it filled a key gap between Fort Totten and Fort Lincoln in the chain of fortifications guarding the seat of government.
Washington, DC
Francis Preston Blair (1791–1876) was one of the most influential political journalists of the Jacksonian era. As founder and editor of The Globe, he gave voice to Andrew Jackson's Democratic agenda and served in the president's informal circle of advisers, the 'Kitchen Cabinet.' His Washington home stood at the center of the era's partisan press and political intrigue.
Washington, DC · est. 1997
Jean Monnet (1888–1979), the French economist remembered as a founding architect of a united Europe, spent part of World War II in Washington working from an office in the historic Willard Hotel. As a member of the British Mission, he threw his talent for large-scale coordination into America's "Victory Program," helping marshal the astonishing surge of industrial output that armed the Allies. Only after the war did he turn that same genius for cooperation toward binding former enemies into a peaceful European community.
Washington, DC
The Jefferson Pier Stone marks one of the earliest surveying reference points laid out in the young federal capital, first placed in December 1804 during Thomas Jefferson's presidency. It once anchored the city's prime meridian, an intended American counterpart to the world's reference lines, and stood near the planned axis linking the Capitol and the President's House. Lost over the decades, the marker was recovered and re-erected in 1889, preserving the original survey position on the National Mall.
Washington, DC
This was the home, from 1804 to 1841, of John Lutz, who had served as a sergeant in General Washington's Guard during the desperate winter at Valley Forge in 1777–78. The elite Commander-in-Chief's Guard protected Washington's person and headquarters through the Revolution's hardest trials. That a veteran of that ordeal lived out his later years here ties this ground directly to the fight for independence.
Washington, DC
Rising at the western end of the National Mall, the Lincoln Memorial honors the sixteenth president who led the nation through the Civil War and preserved the Union. Designed by Henry Bacon as a Greek-style temple and dedicated in 1922, its central chamber holds Daniel Chester French's colossal seated statue of Lincoln, flanked by the carved words of the Gettysburg Address and his Second Inaugural. The famous dedicatory inscription above his head proclaims that Lincoln's memory is enshrined forever in this temple and in the hearts of the people he served.
Washington, DC
Mary McLeod Bethune (1875–1955) was born to formerly enslaved parents in Mayesville, South Carolina, and rose to become one of America's most consequential educators and civil-rights leaders. With little more than resolve, she founded a school for Black girls in Daytona Beach, Florida, that grew into Bethune-Cookman University, organized the National Council of Negro Women, and advised President Franklin Roosevelt as part of the informal 'Black Cabinet.' Sculpted by Robert Berks and unveiled in Lincoln Park on July 10, 1974, the bronze shows Bethune passing a scroll of her legacy to two children, echoing the inscription's charge, 'Let her works praise her.'
Washington, DC
In the early decades of the republic, American leaders dreamed of fixing a national prime meridian through the capital city, freeing the young nation from reliance on Britain's Greenwich line. A series of meridian markers were placed in Washington to anchor this ambition, and the small stone here—inscribed simply "US Meridian 1890"—commemorates that effort to define longitude from American soil. Though the Greenwich meridian ultimately became the world standard, these quiet markers remain reminders of the country's push for scientific and geographic independence.
Washington, DC
In the spring of 1880, Alexander Graham Bell and his assistant Charles Sumner Tainter were experimenting in Washington with the "photophone," a device that transmitted sound on a beam of light rather than a wire. On June 3, 1880, they sent an intelligible voice message between two Washington rooftops, a feat Bell himself considered his greatest invention. This marker stands at the building from which that wireless transmission was launched toward 1325 L Street.
Washington, DC
This plaque marks the Smithsonian Institution Building — the red-sandstone "Castle" on the National Mall — as a Registered National Historic Landmark. The Smithsonian was founded in 1846 with a bequest from British scientist James Smithson, and its first building, completed in the mid-1850s, became the seedbed of America's national museums and research collections. The National Park Service confers the landmark designation under the Historic Sites Act of 1935.
Washington, DC
This ornate French Second Empire building beside the White House rose between 1871 and 1888 to house the State, War, and Navy departments under one roof. For decades it was the command center of American diplomacy and defense, its granite halls witnessing generations of national decisions.
Washington, DC
This plaque marks the Brookland home of Sterling Allen Brown (1901–1989), the poet, critic, and folklorist who spent decades as a professor at Howard University shaping generations of Black writers and scholars. Drawing on the blues, spirituals, and the speech of everyday African American life, Brown insisted that this vernacular tradition belonged at the center of American literature. The quoted lines come from his celebrated poem 'Strong Men,' a defiant anthem of endurance in the face of oppression.
Washington, DC
In the winter of 1864–65, as the Civil War ground toward its end, this three-story brick house on H Street was run as a boarding house by Mary Surratt. Here John Wilkes Booth and a small circle of Confederate sympathizers gathered to scheme first the kidnapping of President Lincoln—hoping to ransom him for Confederate prisoners—before the plot hardened into the April 1865 assassination. The house's connection to the conspiracy made Surratt one of four people hanged that July, the first woman executed by the United States government. The building still stands, its ground floor long since given over to shops.
Washington, DC
Towering nearly twenty feet over Martin Luther King Jr. Avenue, the Big Chair has anchored the heart of Anacostia since the late 1950s, when the Curtis Brothers furniture company commissioned it as a giant advertisement and neighborhood curiosity. Once billed as the world's largest chair, it became a beloved meeting spot and an unofficial symbol of the Southeast Washington community. The 2006 re-dedication marked the chair's restoration and its enduring place in local identity long after the furniture store had closed.
Washington, DC
The Mayflower Hotel opened in 1925 on Connecticut Avenue and immediately became a hub of Washington's political and social life, hosting Calvin Coolidge's inaugural ball as its first major event. Over the decades it entertained every president who followed and served as an in-town residence for vice presidents, cabinet members, Supreme Court justices, and members of Congress. Its Beaux-Arts grandeur earned it a place on the National Register of Historic Places.
Washington, DC
When the RMS Titanic struck an iceberg and sank on April 15, 1912, more than 1,500 people died in the frigid North Atlantic, many of them men who stepped back so women and children could reach the lifeboats. In the years after the disaster, women across the United States raised funds dime by dime to honor that sacrifice. The resulting granite memorial, designed by sculptor Gertrude Vanderbilt Whitney, depicts a robed figure with outstretched arms and now stands along Washington's Southwest waterfront.
Washington, DC
Set just south of the White House on the Ellipse, the Zero Milestone was conceived as the point from which all distances on American highways would be measured, echoing the ancient Roman "Golden Milestone" in the Forum. Authorized by Congress in 1920 and dedicated in 1923, it rose during the early automobile age when good-roads advocates dreamed of a national network radiating from the capital. The U.S. Coast and Geodetic Survey precisely fixed its latitude, longitude, and elevation, anchoring the small granite marker as a symbolic center of the country's road system.