A unique work of art that was created without permission.

This sound-art installation features songs composed using only the Mid-Hudson Bridge as an instrument.

This giant pocket watch is the third iteration of a local landmark that has been standing just off the Santa Fe Plaza for over 100 years.

Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

The fifth-longest natural arch in the world, and the longest outside China.

This mouldering abandoned mental hospital was once a center for progressive healing.

This stone gatehouse was once the entrance to a historic mountain resort, and it had a cameo in a cheesy cult horror movie.

The abandoned ruins of America's first private zoo are open for exploration in the Catskills.

This Cape Cod museum exhibits what it claims is the only authenticated pirate treasure in the world.

These three lighthouses played a fundamental role in the maritime life of Eastham.

Mural fragments and various sculptures honor the longtime artist.

The longest continuous underwater road in North America was built at the insistence of Franklin Roosevelt.

Outstanding taxidermy dioramas showcase the grandeur of the continent's wildlife with spooky realism.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

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

One of only two commuter aerial tramways in the United States.

An unexpected Easter egg lurks in the background of a cherub wall relief at the Breakers mansion.

A 60-room castle constructed by a horse-racing heir.

Mysterious stone tower featured in many alternative histories of the New World.

A crumbling stone stable and carriage house are all that remain of a manse that was once filled with Egyptian artifacts.

Two mermen, eternally spitting into each other's mouths.

An abandoned dollhouse factory.

Look closely and you’ll notice that the color changes a third of the way up the tower.