A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

America's most famous piece of self-built architecture.

Towering basalt columns, a creation of fire and ice.

Eighteen miniature death-scene dioramas.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

A hand-built folk art installation covered with messages of God's love.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

A trash dump made beautiful by nature's power.

A toxic ghost town sitting atop a massive coal fire.

A snapshot of the city's fascinating voodoo culture.

A psychedelic labyrinth on the San Francisco bay.

The rocks in this arid basin leave trails of movement behind them.

The legendary building that needed ghostly approval before being built.

A one-of-a-kind collection of a unique medium.

Dramatic river bend surrounds a natural red-rocked pedestal.