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

This unique historical monument features large concrete spheres designed to resemble fallen stars.

This church built atop a gas station promises to "equip you for the next stage in your life’s journey."

A building shaped like the Army Corps of Engineers logo, because why not?

The word "Watergate" will forever be associated with the infamous scandal in 1972, but this fountain is famous in its own right.

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

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

The oldest continuously operating fish market in the United States.

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

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

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

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.

Home to items never before seen by the public.

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

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

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

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

Go take a picture with the inventor of the daguerreotype photographic process.

A much-maligned monument to teetotalism.

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

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

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

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.