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

The remains of a 12th-century chapter house in Golden Gate Park.

Adolph Sutro's little-known, geographically inaccurate, deprecated monument.

Arcadia is home to a haven for nature geeks and 80s TV lovers alike.

Another of California's unused Cold War missile defense complexes has become a graffiti gallery.

The miraculous hydrant that saved the Mission District in 1906.

San Francisco's oldest operating hotel, with a Victorian atmosphere and a "haunted" fourth floor.

The abandoned train depot now doubles as a well-placed rest stop for those who take the road less traveled.

Two rocks in a perpetual kiss and one of "the most romantic spot in America."

A burnt orange monolithic dome structure perched on a hillside near Interstate 280.

Spiral labyrinth hidden in the hills above Oakland, CA.

The beautiful 1920 Pantages Theatre remains hidden just underneath the LA Downtown Jewelry Exchange.

Two men, two visionaries of Venice Beach, one little hotel that smells like cookies.

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

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

This old mining town, deep in the California desert, has a year-round population of one.

This 19th-century church is now a popular roller rink.

The hidden jewel of Disneyland: a members only playground for the Disney elite.

A pair of large white marble lions guard this stretch of the Mojave Desert, and it is utterly mysterious how they got there.

The interior of the Overlook Hotel in "The Shining" was based on this Yosemite original.

The mysterious round rocks of Schooner Gulch.

Inside an old airplane hangar, friends and strangers alike play on a massive trampoline.

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

Half of a house.