These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

For thousands of years, Native American hunters drove buffalo straight off this cliff in Montana's Yellowstone Country.

A shady solar power system that couldn't hold up to the harsh desert conditions.

A desert settlement founded and later abandoned by Hawaiian members of the Church of Jesus Christ of Latter-day Saints in Utah's Skull Valley.

The old fire tower is one of the last of its kind in the United States.

A working ranch doubles as a sustainable hub for world-renowned classical music and large-scale sculptures.

An apocalyptic seismic event creates a deadly chain reaction that ends with a 6-mile long lake developing within weeks.

This off-the-beaten-path abandoned town is a relic of Montana's silver mining boom.

Mining town from the late 1890s, once home to Calamity Jane.

This amazingly preserved Gold Rush town is a historian's dream.

This now-abandoned outcrop is an important Native American spiritual site, overtaken by European settlers and mining pollution.

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

A technicolor place of worship for Elevationists.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

This UFO landing strip was created by a charitable Wyoming city that was worried about residents of Jupiter.

One of the smallest towns in the United States.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

An abandoned horticulture institute gloomily presides over rows of derelict and vine-wrought greenhouses.

An abandoned castle owned and ignored by Masons carries a cursed history.

This folk art dinosaur was almost pushed to extinction due to lack of a building permit.

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

An enormous cat made of recycled wood scraps.