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

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

An abandoned network of military bunkers and tunnels open for anyone willing to descend into the darkness.

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

A Nevada mining boomtown that ran out of silver and luck.

Abandoned Air Force base that has fallen into disrepair.

A haunted hot springs hotel that went from healing retreat to asylum before it was restored.

This concrete ship has had four careers - World War I tanker, floating amusement park, fishing pier, and artificial reef.

Hundreds of trees made from glass bottles make up this forest on Route 66.

This temple, built by an eccentric religious leader before his death, sits guarded and in ruins.

Carved by a waterfall in a hard-to-reach rock formation, this heart-shaped rock has inspired romantics for decades.

An abandoned Jazz Age dream home and con man's hideout in Death Valley.

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

Ten 25-foot-tall, beehive-shaped kilns, abandoned in Death Valley.

Abandoned anti-ballistic missile base.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

A Bicycle Path in the Sky.

A decommissioned Naval base now rents itself out for people who want to blow stuff up.

A pier that used to act as a busy ferry dock is now a decaying favorite of local fisherman and urban artists.

A hospital closed seemingly in the middle of operations, leaving behind fodder for horror films and ghost hunters.

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

One of the ghostly stops along Route 66.

The liveliest ghost town in the state.