Home to the "Circus" trees created by Axel Erlandson.

In a city filled with Frank Gehry buildings, one stands out as one of the architect's weirder works.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

The largest drain hole in the world.

Abandoned bridge hidden deep in the San Gabriel Mountains.

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

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

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

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

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

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

Established in the '60s, a family-owned tropical drink bar founded by Ray Buhen, bartender to the stars.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

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

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

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

Its buzzing collection honors vibrator history.

A hotel and restaurant serving as the mecca of kitsch.

A hospital closed seemingly in the middle of operations, leaving behind fodder for horror films and ghost hunters.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

Towering basalt columns, a creation of fire and ice.

This shop specializes in oddities and Victorian-inspired wonders.

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