This ancient cave is home to a museum, bar, and is filled with fluorescent minerals.

An enormous roadside pan tells the story of a battle for pie glory.

This once-popular otherworldly landscape was formed by one of the largest volcanic eruptions in history.

This massive melon is a recreation of a similar gate from the Pan-American Expo.

A treehouse assailed by the elements and the government, now gone.

The museum moved on, but the diorama remain.

A graffiti Mecca welcoming artists from around the world.

A tree bears footwear on the loneliest road in America.

The first evidence of some of the Earth's earliest life was found in this fossilized undersea grotto.

Weighing 30,000 pounds, this monument represents Detroit's first industrial era.

A detached cement mixer has been transformed to resemble a relic from some obscure NASA mission to Oklahoma.

What was once the largest NFL stadium.

The perfect place to take a family of giants for a beach vacation.

Two hula hoops appeared on the tree after a storm, and the collection kept growing.

Three-story slide through the New Museum.

This "life-size" depiction of Mickey Mouse as a half-lobster is both whimsical and a bit creepy, standing guard over the Boston waterfront.

In the middle of the desert, miles from any human life, sat an anomalous pay phone that still magically answers your calls.

Scale replica of China's ancient terracotta tomb warriors and Forbidden City are the side project of an eccentric millionaire.

A waterfall 600 ft. inside a mountain, once the bane of gold miners, is now a spectacle of nature.

A whimsical sensor instrument for Minneapolitans to play on their walks to work.

What was once one of the country's largest confectionary plants is now an abandoned ruin, but is still pretty sweet.

A Museum of Holography frozen in 1974.

Furniture tries to escape an abandoned building in San Francisco.

Site of a former hidden treehouse in New Orleans.