This residential door allows San Francisco muggles a glimpse at the wizarding world.

Visible below the waves are memorials to the city's Gold Rush dead.

A modern mechanical planetary system, part of a 10,000 year clock.

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

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

Guns that have been defending San Francisco since 1904.

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

Perfect your fly fishing technique on their practice ponds.

This one-block alleyway is stuffed with street art that is colorful, cultural, and intensely political.

A hidden subterranean installation offers a view of the sky.

Art in the form of a winding, man made crack in stone.

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

A 1920s home transformed into an immersive art experience, where every room is a portal to another realm.

An artsy hidden staircase leads to breathtaking views of San Francisco.

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

A large instrument played by the wind.

A burnt orange monolithic dome structure perched on a hillside near Interstate 280.

This quirky roadside attraction dives into the many theories surrounding North America's most infamous hairy cryptid.

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

A deserted hodgepodge of experimental structures designed by nearby university students.

Offering commanding views of the California coastline, this restaurant was a hub for the artists and bohemians of Big Sur.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

This stretch of beach along California's central coast is a busy highway for the largest seal in the northern hemisphere.