The cobbled together compound of a deceased artist which now serves as a filming location.

A ruined hotel with an unlucky history and an eerie present.

This pseudo-steampunk weapons facility is the world's largest wood and glue structure, and packs quite a wallop.

Where a staggering 747 ships were constructed during World War II.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Guns that have been defending San Francisco since 1904.

A huge musical instrument played by the ocean.

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

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

Factory that once supported an entire company town of 350.

This impressive tunnel was dug entirely by hand over the course of 36 years.

The "3rd largest" city in California is an empty mirage of suburbia in the middle of nowhere.

Carved by a waterfall in a hard-to-reach rock formation, this heart-shaped rock has inspired romantics for decades.

Finale of "William Tell Overture" can be heard as drivers pass over grooves in the road.

The site of murders and Satanic cult gatherings.

The ghostly remains of an accidental sea.

A "haunted" landmark on the coast of Southern California.

An academy where anyone can train in the exciting acrobatic sports of parkour and freerunning.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

Abandoned hotel with adjacent lake and golf course.

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

Abandoned Air Force base that has fallen into disrepair.

Collective dedicated to restoring steam engines.

Abandoned anti-ballistic missile base.