Forgotten and then destroyed by fire, this was once one of the largest saltwater swimming pools in the world.

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

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

This colorful boulder serves as a canvas for political statements and artistic expression.

For nearly 50 years, this San Francisco nonprofit has been serving as a mix of recycling center and art school.

Around the perimeter of San Francisco’s second-largest park is a meandering 2.7-mile path designed to inspire contemplation.

Radioactivity still cause for concern at this urban explorer's paradise.

This mission, established in 1771, is the most remote of California’s Franciscan missions.

An alley covered with 20 years of bubble gum.

Factory that once supported an entire company town of 350.

With its peeling paint and faded sign, this theater-turned-recycling plant is a nostalgic relic of 1950s Americana.

This little gem of Spanish Colonial architecture has been abandoned since the 1950s.

Colorful Native American paintings are hidden within this small cavern.

Get up close to emus and ostriches, or buy their tasty meat.