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

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

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

Go take a picture with the inventor of the daguerreotype photographic process.

This restaurant has been a haven for D.C.'s LGBTQ community since the 1950s.

A super-sized promotional trick that is now a D.C. landmark.

A celebrity from the late Cretaceous period.

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

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

Exact replica of the ancient monument, but much, much lighter.

A piece of outsider public art accompanied by a strange urban legend.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

A wealth of local folk art, antiques, and curios, without ever leaving your car.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The fading, forgotten remains of a once bright and booming factory.

The famed architect designed this Minnesota gas station of the future with a lookout tower.

An Escher-inspired library dedicated to the wonders of the human mind, yet closed to the public.

"World's largest scrap metal sculpture" stands in an outdoor sculpture garden in the middle of Wisconsin.

Mysterious glowing orbs float through the desert night.

Garden dedicated to native carnivorous plants and site of huge flytrap heist.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.