This former boomtown "island" is now submerged below Folsom Lake.

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

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

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

A winding path built in secret on the edge of the continent.

Floating man-made island and upscale restaurant.

Visible below the waves are memorials to the city's Gold Rush dead.

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

Law-protected wreckage serves as a peculiar memorial for an almost forgotten World War II tragedy.

Version of the French Riviera destroyed by the sea.

The ghostly remains of an accidental sea.

Abandoned hotel with adjacent lake and golf course.

A huge musical instrument played by the ocean.

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

San Francisco Bay's ghost town.

The remains of a Canadian train crash are now mouldering beneath layers of rust and graffiti.

This abandoned motel doesn't welcome guests anymore, but decay and a creepy atmosphere still call it home.