Through the decades, Black music stars have performed at this historic hub for music and the arts.

A secret greenspace hides atop a Capitol parking garage.

Atop this media building, two hives containing more than 30,000 bees keep the surrounding area vibrant.

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

A promising candidate for the lost rock laid by George Washington was unearthed, but the hunt is still on.

Also known as the Founding Church of Scientology.

During Prohibition, the U.S. Congress had an "official" bootlegger, with his own Capitol Hill office.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

Amid the sprawling Defense Intelligence Agency Headquarters is one of Washington's least accessible museums.

The district's only illusionarium supports free writing programs for local students with every purchase.

100 years later, they're still down there.

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

Sit where JFK proposed to Jackie or where Nixon dined on meatloaf at this storied pub.

A fantastic array of trays and cables once whisked books over to the Capitol at 600 feet per minute.

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

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

Where the U.S. government kept its actual treasure, before Fort Knox.

In the basement of the U.S. Capitol Building is a hidden storage room full of ornate floor tiles leftover from the 1850s.

A clone of a cloned tree that was so important it allegedly had its own guards.

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

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

This unassuming layer of clay boasts an out-of-this-world origin story.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.