This small glass cube is a peaceful out-of-the-way sanctuary at the busy airport.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

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

Wedged between two sets of row houses is an awkwardly located family graveyard.

The tomb was guarded by soldiers from both sides of the war, and some left their initials carved in the brick.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

A six-foot pair of socks hangs from a drawer of the world's largest bureau.

The island residents are known for taking their quirky sense of humor with them to the grave.

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

Part of a WWII submarine is lurking outside the Washington Navy Yard parking lot.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

A lawn full of retired spacecraft on display at one of NASA's first research labs.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Perhaps the most scandalous statue of America's first president.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

A faded sign from the 1920s remembers Baltimore's resistance toward banning alcohol.

The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.

The rogue roots are gradually consuming some of the historic marble grave markers.

The naval commander’s proudest moment in battle is memorialized in this unique tomb at Arlington Cemetery.

An overlooked memorial honoring the local Washington residents who died in World War I.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

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