This small plaque along the walking path on the Mall at Fourth Street and Madison is the only private monument on the Mall, dedicated on September 9, 1951. It commemorates the founding of the National Grange of the Order of Patrons of Husbandry, a…

This historical survey stone was established in 1793 to mark the prime meridian of the United States. It was also intended to mark the intersection of direct lines from the middle of the Capitol and the White House, but it is in fact a little off…

Eighteen steps from the top landing of the Lincoln Memorial, an inscription marks the spot where Dr. Martin Luther King Jr. stood to give his "I Have a Dream" speech in 1963. The marker was placed in 2003 to mark the 40th anniversary of that speech.…

Commemorating the first air mail flight connecting Washington, Philadelphia, and New York, the Aero Club of Washington placed this plaque in 1958 to mark the 40th anniversary of that flight. Following 52 experimental flights by the Post Office…

The current zero milestone dates from the spring of 1923, replacing a temporary marker placed on this site in President's Park in 1919. Originally intended as a central point from which to measure highway distances throughout the United States, the…