This tree is a living witness to the beginning of the Civil Rights Movement.

The final resting place of an unidentified revolutionary soldier sits behind a Virginia church.

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

Once forgotten and built over, this historic Black cemetery now houses a poignant memorial.

This grave marks the passing of a historic Jane Doe whose identity remains a mystery to this day.

Once the largest trading firm of enslaved people in the U.S., this building is now a museum that preserves Alexandria's dark past.

The narrowest house in America is seven feet of pure spite.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

This small pedestal marks the spot of the first lot of land sold in Alexandria, Virginia in 1749.

An original apothecary from 1792.

A former major munitions plant that has been converted into a sprawling art space.

A massive, majestic mammal watches over pedestrians from his perch atop a former B.P.O.E. lodge.

Museum houses an impressive display of the origin and artistry from the now-quaint invention's history.

A tribute to two brothers' artistic endeavors.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

A 60-room castle constructed by a horse-racing heir.

A former seaside jewel built for the everyman is now simply a neglected art deco fortress.

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

The Virginia farm where John Wilkes Booth met his grisly end is now largely forgotten.

The innocent intentions of this monument are somewhat lost in the sculpture's muscled imagery.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

The rare American Civil War-era weapon was never fired in anger.

The home of pigs, snakes, chameleons, and the alleged largest bunny in the United States.