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

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

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.

The "Key of Keys" for Washington, D.C. and the apocryphal landing place for the military campaign that started George Washington's career is now at the bottom of a well.

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

The world's oldest soul food restaurant is also one of its best.

This Queens hospital has stood abandoned for almost 20 years after its patients were secretly relocated in the dead of night.

A former seaside jewel built for the everyman is now simply a neglected art deco fortress.

This 19th-century clock has been restored to help withstand the harsh environment of its seaside home.

The ballpark in "Pigtown" where the Brooklyn Dodgers made their name was replaced with a huge apartment complex.

This neo-Gothic former auto showroom is one of the few remaining reminders of Brooklyn's "Automobile Row."

A Jewish deli run by Yemeni Muslims in an Afro-Caribbean neighborhood is quintessential Brooklyn.

Dedicated to preserving the history of free Black communities in Brooklyn and beyond.

A labor of love by laborers in the sign-making business.

This otherwise innocuous bodega was once the headquarters of the most feared assassin's guild in American history.

Oldest surviving example of a Dutch saltbox frame house in America.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

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

An echo chamber with a waterfall wrapped around its base at the Embassy of Canada in Washington, D.C.

The "lovely red Vega" of the legendary record-settling pilot.