Home to items never before seen by the public.

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

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

A historic neighborhood church is reborn as a psychedelic arts collective.

A line of blue paint marks the route of the inaugural parade.

At 207 feet, one of the world's longest continuous escalators.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

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

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

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

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

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

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

A computer bug so primitive it was an actual insect.

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.

The romance of early commercial flight still fills this Art Deco destination.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

The national park was once a plantation estate.

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

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.