The neighborhood shop is a sort of tiny cactus museum full of exotic specimens you can take home.

One of the last free public hot springs is decorated with hippie art.

The unbelievably opulent home built for an infamous newspaperman.

The abandoned personal amusement park of the King of Pop.

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

San Diego's most historic and haunted home.

A common entry point to the Griffith Observatory trail holds its own wonders.

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

The site of murders and Satanic cult gatherings.

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

This massive redwood tree has a hole in the base big enough to drive through.

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

A "Titanic" superfan changed his name to Jack and set up this strange shrine to the blockbuster, complete with Korean food and Tarot readings.

The final resting place of a space program monolith.

Her final resting place was intended to be modest and private, but the power of her popularity continues to draw visitors.

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

The largest drain hole in the world.

Abandoned bridge hidden deep in the San Gabriel Mountains.

The largest permanent Monopoly board makes one of the longest games even bigger.

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

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

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

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

The last of its kind in the country.