A vast city of the dead, where the deceased outnumber the living by more than a million.

A hidden world of exotic succulents and cacti.

Swarms of butterflies cannot compare to the awe inspired by the publicly-funded nakedness once displayed in this sunken garden.

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

Before it was abandoned and left to rust alongside the road, this riverboat starred in a John Wayne movie.

A famous alternative culture epicenter and where Joplin serenaded young hippies.

This one-block alleyway is stuffed with street art that is colorful, cultural, and intensely political.

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

Once a place of peaceful repose, this sanitarium now faces an uncertain future.

Come crisp December nights, this fairly plain neighborhood becomes a holiday dream world.

One of the world's longest murals depicts the history of diversity in Los Angeles.

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

A grove of "candelabra redwoods" deep in California's Lost Coast.

A monument to the love people have for their pets.

A promotional sun clock on the site of San Francisco's great raceway.

Rodin's famous depiction of Dante's 'Inferno', amidst a sculpture garden of many of his other works.

A former utopian healing center created by a huckster and built by derelicts.

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

Gold Rush-era tombstones line the park's paths.

Julia Morgan's Moorish-Gothic labyrinth of fountains, trees, natural light and Oakland's notable dead.

The abandoned personal amusement park of the King of Pop.

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

World War II-era Nazi compound nestled in the Santa Monica hills.

Costumed elves and mountain bikers co-exist peacefully at this abandoned Christmas-themed adventure park.