Located on 420 acres in the high desert, this spiritual center is dedicated to the "science of the future."

The unbelievably opulent home built for an infamous newspaperman.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

A 300-ship graveyard, with a few still visible at low tide.

A meditative space out of a fantasy story.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

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

A 140-year-old castle with underground caves hidden in San Francisco.

World's largest collection of serial killer artwork and other macabre exhibits.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

One man's personal collection of more than 2,000 creepy-crawlies from around the world.

A small collection of iguana-infested ruins hides amid Cancún's bustling hotel zone.

The Acropolis of this little-visited Mayan archaeological site offers great views of Chiapas’s Lake District.

Cave where bat-eating snakes hang down from the ceiling.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

The jewel of western Mexico's archaeological legacy is this tiered circular pyramid now covered in grass.

A museum in the former home of Marxist revolutionary Leon Trotsky.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.