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

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

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

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

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

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

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.

A street in front of NASA's D.C. headquarters has been named in honor of the Black women who were essential to early spaceflight.

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

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

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

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

The United States Capitol's former columns still stand.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

Once the supplier for noteworthy projects like the National Cathedral, this old brickworks now lies abandoned.

Art deco landmark on the outskirts of Washington, D.C.

Where you can hail your favorite fictional commanders-in-chief.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

Part of a WWII submarine is lurking outside the Washington Navy Yard parking lot.

Outside the Department of Transportation, a collection of artifacts honors the history of how we get around.

This statue of one of baseball’s greatest pitchers looks like something out of a sci-fi horror movie.

A secret greenspace hides atop a Capitol parking garage.

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