A "haunted" landmark on the coast of Southern California.

The sun acts as a key that only fits this giant keyhole twice a year.

Version of the French Riviera destroyed by the sea.

Law-protected wreckage serves as a peculiar memorial for an almost forgotten World War II tragedy.

This Pringle-shaped ledge makes for the perfect photo op.

This Oakland fairytale kingdom, fiercely devoted to childlike whimsy, was an early inspiration for Disneyland.

The world's largest wooden trestle stretches across this desert canyon in Anza-Borrego Desert State Park.

The largest dune field in the Mojave offers a chance of hearing the 'singing sands.'

A working model of the entire San Francisco Bay and much of the Sacramento River Delta, complete with regular tides that change every 14 minutes.

Sunset-colored dunes of volcanic ash make taking a poor photo impossible.

Travelers leave tea kettles in a remote part of Death Valley as part of a mysterious, decades-old tradition.

California's own majestic geyser is powered by a subterranean volcano.

Smooth basaltic rocks tell a tale of ancient glacial waterfalls.

An abandoned, unfinished mansion on grounds strewn with lava rocks.

A Mysterious Masonic tomb in San Luis Obispo.

A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

From Japan to Italy, this California park explores the world's cultures through their gardens.

A hard-to-reach oasis in a desolate corner of Death Valley National Park.

Half of a house.

The ruins of the castle that chemicals built.

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

An "anarchical" no man's land, complete with garbage sculptures and a hobo-run "Landfillian Library."

This quirky roadside attraction dives into the many theories surrounding North America's most infamous hairy cryptid.

A playground built by the kids that is a child's wonderland, and a helicopter parent's nightmare.