A propulsion engine testbed that paved the way for the Space Shuttle launch sits without recognition at this rocket center.

What else would you call a playground hidden in Alabama's oldest and largest cemetery?

The most decorated dog of World War I is preserved in the Smithsonian.

Perhaps the most scandalous statue of America's first president.

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

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

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

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

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

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

Behind an abandoned storefront is an example of pioneering 1930s gas station architecture.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

There’s a hidden military meme engraved on the World War II Memorial.

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

An overlooked memorial honoring the local Washington residents who died in World War I.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Decades before the scandal, this staircase on the river was a literal "water gate."

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

The national park was once a plantation estate.

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

This church built atop a gas station promises to "equip you for the next stage in your life’s journey."

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

The rogue roots are gradually consuming some of the historic marble grave markers.

One street divides a single town that stands in two U.S. states.