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.

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

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

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

A historic arena where the Beatles played their first concert in the U.S.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

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

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

This lovely pocket park is one of the most under appreciated in D.C.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

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

Decades before the scandal, this staircase on the river was a literal "water gate."

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

A celebrity from the late Cretaceous period.

Four bald cypress trees in Lafayette Square, across from the White House, mark the southern edge of a 100,000 year old cypress swamp.

A super-sized promotional trick that is now a D.C. landmark.

There's a crumbling old mansion inside the Smithsonian National Zoo.

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

The oldest continuously operating fish market in the United States.

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

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