Eons ago, a rushing lava river formed this pristine passage through solid rock.

Ancient pueblos built into the base of a natural canyon wall.

Once the product of an inexplicable gold strike, this ghost town is now home to one man and his love of classic machines.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

Outsider Art Community.

An old trolley bridge was converted into a breathtaking garden bursting with colorful flowers.

This former Masonic hall has been turned into an art project that uses even more metaphysical iconography.

An enormous, inside-out glass globe built in 1935.

Museum dedicated to awful artwork.

The bears may be gone, but their old cages can still be found.

Beautiful steampunk ghosts of early Massachusetts.

Adherence to strict Jewish laws is required to enter this ultra-conservative New York village.

This tiny church near Sleepy Hollow contains Henri Matisse's last work, a rose window, and nine windows by Marc Chagall.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

"A hideous albatross in the Hudson River Valley."

Three acres of mythology-inspired sculptures are visible from the highway.

This rare symbol of Eastern philosophy in the West has been created over years of painstaking construction by the local community.

Locals purchased this abandoned quarry in order to make sure it continues to be overgrown.

This small-town Connecticut restaurant gives each diner a free book from its vast library.

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

A museum dedicated to the quirky and colorful world created by Springfield's favorite son.