The key to turning shifting dunes into the green oasis of Golden Gate Park.

Shoot for par over the bodies of the dead on this cemetery-cum-golf course.

Concrete strongholds stand guard over the Golden Gate.

A working model of the entire San Francisco Bay and much of the Sacramento River Delta, complete with regular tides that change every 14 minutes.

This whimsical seashell-shaped place of worship was designed to blend into its surroundings.

The former Naval shipyard is open for exploring - mostly.

'Cause the fence start shaking, the earth was quaking.

Built by the inventor of the radio, this abandoned hotel has housed early radio employees, military men, and a dangerous cult.

A poignant memorial to a young boy whose death spurred a dramatic increase in organ donations in Italy—dubbed the "Nicholas Effect."

California's own majestic geyser is powered by a subterranean volcano.

The haunting ruins of Jack London's dream house.

Monumental sculptures of Patrick Amiot, constructed from debris, detritus, and determination.

340 bicycles, 65 feet high.

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

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

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

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Its buzzing collection honors vibrator history.

Inside an old airplane hangar, friends and strangers alike play on a massive trampoline.

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.

This turn of the century masterpiece has a mysterious goaty interloper.

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