This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

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

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.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

A much-maligned monument to teetotalism.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

A celebrity from the late Cretaceous period.

The "lovely red Vega" of the legendary record-settling pilot.

It was once the base for a series of domestic terror attacks.

The most decorated dog of World War I is preserved in the Smithsonian.

There’s a special club house at the top for the bell ringers.

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

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

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

The national park was once a plantation estate.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

There’s a hidden military meme engraved on the World War II Memorial.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

A painfully obvious spy house sits right across the street from the Russian Embassy.