An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

One person's lost luggage is another person's treasure.

This weird abode has inspired everything from the "House On Haunted Hil" to a robot hunter's pad.

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

Odd outsider art installations surround a Gold Rush-era ghost town.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

A strange house built only at night, with rumored mystic inspiration.

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

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

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

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

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

A layered tribute to the work of mosaicist Isaiah Zagar.

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

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

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

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

An emerald-green grotto just a short trip from Austin.

A crumbling hospital from the 1850s on Roosevelt Island.

Rippling sand dunes frozen in the Arizona rock.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."