This Great Depression-era creation was once known as the strangest house in the world.

Beautiful stained glass depictions of the history of human flight fill this surprising chapel.

Where the embers of the Big Bang were first detected.

A unusual sanctuary for abused and exotic animals in South Jersey.

Destructive children, start your engines.

This massive boulder is either a unique rock formation created by glacial melt or a magic energy vortex.

The boulder on which Alexander Hamilton laid his head after a deadly duel can still be visited on the New Jersey coast.

Step inside Lucy, the world's largest "elephant."

Whimsical artist house in the New Jersey woods.

A reservoir of vintage pinball machines and arcade games for the nostalgic and thrill seeking.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

A unique sculpture park that specializes in the huge and bizarre.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

Corn-inthian columns with a uniquely American take on neoclassical architecture.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

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

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

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

Perhaps the most scandalous statue of America's first president.

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

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

The first presidential bomb shelter was located in an old vault under the Treasury, connected to the White House via tunnel.

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