The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

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

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

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

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

A brass plaque dedicated to a convicted cannibal hangs in the National Press Club, and that's not even the craziest part of the story.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

The hidden offices underneath Memorial Bridge have been locked up since 1976.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

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

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

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

The most accurate timepiece in the world.

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

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

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

A rotating cast of guys and dolls in front of a Washington, D.C. building.

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

Seemingly unremarkable items like empty sushi trays, chef hats, and freshness stickers are being preserved so future generations can look back on this beloved cultural import.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

The national park was once a plantation estate.

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