Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

These recently uncovered walls are all that's left of Washington, D.C's first defense contractor.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

This stately mansion, built in 1787 by America's first Secretary of the Navy, is rumored to be one of the most haunted buildings in Washington, DC.

Also known as the Founding Church of Scientology.

A 9-story, poured concrete structure which was used as a glue factory with an indelible smell.

Ride the subways of yesteryear.

An eerie, abandoned military base engulfed by nature and graffiti is now home to a local park.

A museum dedicated to exhibiting remarkable outsider art.

Despite repeated attempts to make it work, this former mining town is now nothing but dust and memories.

One devoted couple has donated multiple recreations of Michelangelo's sculptures to this South Dakota town.

This monument remembers one of the manliest men of the frontier who fought a grizzly before dragging himself 200 miles to safety.

This geodesic gallery holds a collection of painted spheres that make traditional canvases look lazy by comparison.

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

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

Obscure Freemasons still live in D.C.’s largest private residence.

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

A haunting tribute to pioneering photographer Clover Adams.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.