A playground the size of a city block is a modernist monument to civic values and public housing.

More than 500 unique and specially designed cases collected by D.C.'s "Harmonica Case Man."

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

This charming wooden church was disassembled and moved not once but twice before settling in this Prague garden.

Once forgotten and built over, this historic Black cemetery now houses a poignant memorial.

The only place for a truly presidential dram.

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

A daily replay of the experiment that proved the rotation of the Earth.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

A drab two-story office space in Delaware is a hidden tax haven for Hillary Clinton, Donald Trump, and over half the Fortune 500 companies.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

The oldest surviving botanic garden in the United States.

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

World's first "penitentiary," meant to be humane, drove men insane.

A rare view of a preserved Victorian science museum.

Scattered around Atlanta are little doors with big charm.

The only subterranean ping pong table in Atlanta.

A priceless collection of the Nation's cryptologic history.

The land is home to swimming ponies and a legendary 18th-century treasure.

This free, take-a-book shop seems like a trick but isn't.