A regular looking rock with an unbelievable history.

Michael Heizer's masterwork in the Nevada Basin.

Museum dedicated to the preservation of surf culture.

Monumental sculptures of Patrick Amiot, constructed from debris, detritus, and determination.

This massive crater in the middle of nowhere was used to train astronauts for moon landings.

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

Built by the inventor of the radio, this abandoned hotel has housed early radio employees, military men, and a dangerous cult.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

This cave was hidden for thousands of years, storing the worldly goods of ancient Native Americans.

340 bicycles, 65 feet high.

Only intact Ichthyosaur skeleton in the United States.

'Cause the fence start shaking, the earth was quaking.

Authentic gondola hanging from the ceiling, notable mural in the back room.

A black and white mural stands out from its psychedelic surroundings.

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

Outsider art or homage to aliens?

A mysterious and endangered parasitic herb from the California desert.

San Francisco’s condensed garden of incredible plant growth.

The best place in the park to test out your throwing arm.

A brooding mansion of clinker brick stands out among the Victorian houses of Pacific Heights.

Gold Rush-era tombstones line the park's paths.

San Francisco's oldest operating hotel, with a Victorian atmosphere and a "haunted" fourth floor.

Historic funicular railway, believed to be the shortest railroad in the world.

Legendary frontman of the Doors looms in this giant mural by famed Venice muralist, Rip Cronk.