Spiral labyrinth hidden in the hills above Oakland, CA.

Ten 25-foot-tall, beehive-shaped kilns, abandoned in Death Valley.

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

Commonly referred to as the most photographed Victorian home in the United States.

Megachurch turned Catholic church comprised of 10,000 glass panes.

Playable, historic pinball machines fill this Alameda museum.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

The fossilized remains of ancient California redwoods.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

A large instrument played by the wind.

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

This grand mansion has starred in everything from Bones to Buffy.

An optical illusion found amid a logged redwood forest.

The highest dunes in California are the most likely place in the area to hear the Singing Sands.

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

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

The "3rd largest" city in California is an empty mirage of suburbia in the middle of nowhere.

A bigger-than-life pun that has become a beacon of altruism.

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

A popular tourist cave with a dark past.

This ultra-modern home clings to the slope of the Hollywood Hills on a precarious stilt.

Acres of natural wonders left behind by a socialite-turned-gardener.

An extensive collection of ancient Egyptian artifacts and mummies.

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