An alley covered with 20 years of bubble gum.

A Mysterious Masonic tomb in San Luis Obispo.

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

Subterranean house made out of a grain silo, located in the Santa Cruz Mountains.

A store that sells all manner of bones, insects, and animal curiosities.

A celebration of once forgotten materials.

A private home built to resemble the shape of a microscopic creature.

An amazing collection of fantastic reptiles, amphibians, spiders, and insects.

A large instrument played by the wind.

One of the best absinthe distilleries in the United States.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

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.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

An enormous illuminated figure dances on the Las Vegas strip.

Guns that have been defending San Francisco since 1904.

Join the circus for a few lessons to learn clowning, acrobatics, and Chinese contortion.

A free, public museum dedicated to the fascinating science of sight.

The restored and active Victorian-era final resting place of San Francisco.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

An overlooked and unassuming engineering marvel.

Only hotel where you can legally launder money.

Alleyway plaque commemorating the death of a fictional character in The Maltese Falcon, not far from the author's home.

Furniture tries to escape an abandoned building in San Francisco.