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

A psychedelic labyrinth on the San Francisco bay.

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

A Barbary Coast watering hole built into a Gold Rush shipwreck.

This partially buried wreck is one of the most complete of its kind but is only revealed when the sea allows.

A monument to the love people have for their pets.

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

A man-made island in scenic San Francisco Bay.

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

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

Overflowing with shipping containers, this location has been transformed into a massive workspace for artists.

A speck of nature and art in one of San Francisco’s most notorious neighborhoods.

This print shop boasts one of the largest pinball arcades in San Francisco.

The rusting remains of the largest assembled WWII fleet on the West Coast.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.