This unique museum cafeteria showcases the history and regional diversity of African American cuisine.

A celebrity from the late Cretaceous period.

A brass plaque dedicated to a convicted cannibal hangs in the National Press Club, and that's not even the craziest part of the story.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

The oldest continuously operating fish market in the United States.

When it opened during the final years of the embargo, all the drinks and cigars were free.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

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

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

A painfully obvious spy house sits right across the street from the Russian Embassy.

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.

Home to items never before seen by the public.

The shelves in the back of this thrift store are devoted to saving, not selling, retro tech.

Once damaged by Hurricane Agnes, this bridge is now on the National Register of Historic Places.

The oldest military monument in the United States.

Although built to generate electricity for Marylanders, this dam has become an all-you-can-eat buffet for American bald eagles.

One of the oldest active carousels in the country—but it might be missed by all but the keenest-eyed boardwalk strollers.

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

A mammoth pair of Civil War artillery guns abandoned out in the forest.

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

A sad reminder of the World War II bombing stands largely unnoticed on a street corner.

The largest archaeological site from the Yayoi period.