The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

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

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

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

There’s a hidden military meme engraved on the World War II Memorial.

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

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

The site of the climactic scene from the classic horror film is now a historic landmark.

The United States Capitol's former columns still stand.

The first and only carousel with a lineup entirely of insects.

The 28-foot granite map plots the locations of 40 theaters in New York City.

Elevated freight railway turned wildly successful urban park.

This monument remembers the first Japanese Americans forcibly relocated during World War II.

Allowing humans and fish alike to migrate from freshwater to saltwater and back again.

This former coal gasification plant found a curious second life as a popular public park.

A wall of chewing gum moonlights as collective art.

A museum dedicated to the history and exploration of both popular music and science fiction.

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

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

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

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

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

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

Long buried under the 20th-century landscape, this lift lock of the Alexandria Canal is the lone remnant of an ambitious early American transportation project.