The Burnside Fountain and its questionable interpretation.

This little-known rival to the Library of Congress houses one of the largest collections of pre-1876 American books, newspapers, and manuscripts.

A comic book store got the road by its shop officially renamed after Superman's girlfriend.

This miniature feudal castle was built on a whim to honor a US Navy pioneer.

The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

A simple but powerful tribute to the 20 victims of the 1692 witch trials.

The largest earthwork effigy in the world.

A gift from Japan, 17th-century lantern stands among the cherry trees at D.C.'s Tidal Basin.

This library is designed to commemorate the work of the Human Genome Project.

This lifelike sculpture of a policeman serves as a helpful reminder to watch out for crossing pedestrians.

Unique tower has outlasted a takeover of the company.

A pharmacy built in the shape of a mortar and pestle, now resembles a fancy cocktail.

According to the experts at the Guinness World's Record office, this is the longest candy counter in the world.

One artist’s scheme to expand museum viewing hours into the evening led to the illumination of an entire city.

This grand gothic brewery has been pumping out suds for over a hundred years.

A hidden alley in urban Baltimore is a haven for graffiti artists.

This is the last surviving Bollman truss bridge in the world.

A lawn full of retired spacecraft on display at one of NASA's first research labs.

The first partially complete dinosaur skeleton was discovered here, forever changing the world's view of the ruling reptiles.

The 320-year-old tree that greeted General Lafayette and rerouted an interstate highway.

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

This former asylum for Black Americans is haunted by its history of violence and racism.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

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