A museum dedicated to exhibiting remarkable outsider art.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

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

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

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