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

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

Furniture tries to escape an abandoned building in San Francisco.

These subterranean storage areas hold emergency water reserves.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

A wall of chewing gum moonlights as collective art.

Quite simply the largest tree in the world (by volume).

The first life claimed by this record-breaking peak wasn't lost to exposure or a fall but rather lightning.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

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

This subtle Berkeley paving stone actually marks off a lawless tube of air that extends into space.

Explore 10 acres of environmental sculptures.

Experience a quartz crystal sound bath inside a storied, all-wood sound-chamber.

An eclectic trailer park retreat in the middle of the California desert.

On a barren hillside in the Yucca Valley, the recently restored Desert Christ Park has attracted pilgrims and kitsch hunters for over 50 years.

Deep scars on the earth left by the Ice Age.

This Oakland fairytale kingdom, fiercely devoted to childlike whimsy, was an early inspiration for Disneyland.

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

An vast warehouse of everyday treasures in Berkeley, CA.

One of the best absinthe distilleries in the United States.

A hidden garden of stones engraved with scriptures, a Joseph Smith Sphinx, all carved by one man.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.