The abandoned personal amusement park of the King of Pop.

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

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.

San Francisco Bay's ghost town.

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

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

One of the ghostly stops along Route 66.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

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

The site of murders and Satanic cult gatherings.

Costumed elves and mountain bikers co-exist peacefully at this abandoned Christmas-themed adventure park.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

The final resting place of a space program monolith.

Abandoned bridge hidden deep in the San Gabriel Mountains.

An unfortunate geological resemblance to Satan has labeled this Pasadena gorge as a passage to the underworld.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

Experience a quartz crystal sound bath inside a storied, all-wood sound-chamber.

Finale of "William Tell Overture" can be heard as drivers pass over grooves in the road.

A meditative space out of a fantasy story.

Stripes of flowers bloom each spring in a 50 acre rainbow of color.

Canyon walls shrouded in ferns.

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

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.