A hidden subterranean installation offers a view of the sky.

This private residence was the template for one of the most beloved television homes of all time.

This 19th-century church is now a popular roller rink.

Golden Gate Park's historic collection of plants.

Olfactory delights in San Francisco's Botanical Gardens.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

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

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

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

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

A huge work of Burning Man-inspired outsider art on the grounds of a California winery.

An ever-updating collection of retro Americana.

Sunset-colored dunes of volcanic ash make taking a poor photo impossible.

This lesser known Hearst estate is a fairytale village built from the stolen bones of historic European buildings.

The largest dune field in the Mojave offers a chance of hearing the 'singing sands.'

Mexican food and folk art.

No one's quite sure why there's a metal megaphone bolted on two rocks in the middle of the Mojave Desert.

Colorful sedimentary rock layers provide opportunities both for hiking and photography.

The set location for a 1987 cult classic draws international film buffs to the middle of the Mojave Desert.

This temple, built by an eccentric religious leader before his death, sits guarded and in ruins.

A pair of large white marble lions guard this stretch of the Mojave Desert, and it is utterly mysterious how they got there.

The ghostly remains of an accidental sea.

The biggest pinball arcade in the world has over 600 pinball machines, and 300 arcade machines.

While you're unlikely to find riches here these days, this remote mine is a time capsule of the Gold Rush era.