Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

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

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

Look closely and you’ll notice that the color changes a third of the way up the tower.

Washington's iconic carousel has a nice piece of Civil Rights history.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

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.

The privately owned cemetery that holds room for Washington's finest when they step down from life.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

The United States Capitol's former columns still stand.

Taste the white whiskey that the United States' first president once distilled and enjoyed.

A memorial dedicated to a highly decorated Marine and Korean War veteran, who also happened to be a horse.

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

The Pentagon sits on a former island that was in Virginia at low tide and D.C. at high tide.

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

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

Rumor has it the hot dog stand was targeted by two Russian nuclear missiles.

The maritime museum that boasts the largest nautical library in the western hemisphere.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

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

Outsider art meets paleontology at this roadside reptile repository.

The Vermont square that inspired Shirley Jackson's "The Lottery."