A psychedelic labyrinth on the San Francisco bay.

An "anarchical" no man's land, complete with garbage sculptures and a hobo-run "Landfillian Library."

Dive bar built out of the remains of a whaling ship.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

Bits and pieces from the ill-fated Donner Party's winter cabins.

340 bicycles, 65 feet high.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

Cadillac where country's first big star was found dead.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

The country music legend's grave is surrounded by Astroturf because fans kept plucking out the grass.

Even Henry David Thoreau found this glacial pothole irresistible.

City Council meetings still happen in this historic building, impeccably preserved on the inside.

Concrete strongholds stand guard over the Golden Gate.

The Empire Mine is "one of the oldest, largest, deepest, longest and richest gold mines in California."

This historic California cemetery holds the bodies of veterans of both the Civil War and the Donner Party.

Art from the latest counter-culture; kids who dye their hair blue and believe the future will be a post-apocalyptic water world.

The haunting ruins of Jack London's dream house.

The largest drain hole in the world.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

World-famous, Pink's still manages to keep its prized cult fetish status.

The magic's in the hole!