Bad farming practices caused this unnatural natural wonder.

Stroll the grounds built by murder, suicide, and dirty oil money at one of Hollywood's most filmed mansions.

This historic national park is covered in the stunning ruins of red rock pueblos.

This concert pavilion on the shore of the Great Salt Lake has been destroyed by fire, water, and disinterest but keeps coming back.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

Abandoned concert venue legendary for its rock counterculture.

This shop and studio is dedicated to the art of the book, from letterpress to bookbinding.

San Franciscans leave gifts and messages for the magical beings that live behind the tiny, mysterious door installed on a tree in Golden Gate Park.

This crumbling UFO is one of only a few remaining "moveable ski chalets" of its kind.

These millipedes glow not out of attraction, but as a not-too-subtle warning.

Giant origami sculptures tucked into desert scenery beckon passers-by to explore further.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

Japanese gardens dedicated to the Japanese farmer that refused to throw in the trowel.

Prison made famous by The Shawshank Redemption has been out of commission since 1990.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

A wunderkammer hidden on the top floor of the Hartford statehouse.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

This institution collects the history of burlesque dancing with a titillating collection of ephemera and pasties.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

The secret city built by the Manhattan Project.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

Twin Peaks' real life Double R Diner has been restored to its damn fine television look.

An Escher-inspired library dedicated to the wonders of the human mind, yet closed to the public.