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

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.

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.

The largest drain hole in the world.

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

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

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

Everyone remembers Laurie Strode from Halloween, but this is the house where most of the blood was shed.

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

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

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

Explore 10 acres of environmental sculptures.

Visible below the waves are memorials to the city's Gold Rush dead.

An inconspicuous footbridge beloved by San Diego locals.

A ghost town at the airport is now a refuge for blue butterflies.

Eons old volcanic activity created one of the most stunning rock formations in the United States.

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

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

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

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

Canyon walls shrouded in ferns.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

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