This sculpture forces visitors to confront their relationship with space.

This unique house, the only one of its kind in Brooklyn, was built as part of a real estate developer's showcase.

Before online banking and smartphone apps, there was "commuter banking" in the subway in Downtown Brooklyn.

The only surviving sidewalk clock in Brooklyn.

New York's southernmost subway station is whimsically wavy.

This striking arch, one of the first architectural elements constructed in Prospect Park, was recently restored to its original glory.

Waterway populated with abandoned projects, including a submarine.

This outdoor gallery of graffiti-covered walls pays homage to the past, present, and possible future of street art.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

Rumored to be the famed pirate's lookout tower, this historic stone structure is now just watching for tourists.

You’ve heard of bookworms, but this small sculpture at a university library may be the world’s first bookbee.

A wonderfully curated used bookstore in an airport.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

No one really knows how these old hobby horses got here, but the herd keeps growing.

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

This beloved marketplace mascot poops money and grants good luck.

Washington D.C.'s most famous pianist, composer, and bandleader still tickles the ivories outside Howard Theater.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

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

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

A large wind turbine installation in central Washington State is home to an extensive set of interpretive exhibits.