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

Tiki luxury on Nob Hill.

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

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

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

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

World-famous, Pink's still manages to keep its prized cult fetish status.

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

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

San Francisco's newly reopened hands-on science museum.

A museum befitting the city responsible for supplying the majority of the world's LSD.

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

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

Along a California highway is a kind of Jurassic Park made of metal.

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.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

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

Resting place of Hollywood's immortals is also site of summer film screenings.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

America's most famous piece of self-built architecture.

The ghostly remains of an accidental sea.