One of the ghostly stops along Route 66.

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

San Diego's most historic and haunted home.

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

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

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

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

Abandoned bridge hidden deep in the San Gabriel Mountains.

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

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

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

An inconspicuous footbridge beloved by San Diego locals.

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

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

A modern mechanical planetary system, part of a 10,000 year clock.

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

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

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

San Francisco's newly reopened hands-on science museum.

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

A castle that was built stone by stone by an eccentric journalist.

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

A library of rare occult books in Los Angeles.