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

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

The remains of a ruined mansion memorialize the 1906 earthquake.

A 300-ship graveyard, with a few still visible at low tide.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

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

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

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

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

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

Olfactory delights in San Francisco's Botanical Gardens.

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

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

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

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

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

A 140-year-old castle with underground caves hidden in San Francisco.

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

A huge musical instrument played by the ocean.

Before it was abandoned and left to rust alongside the road, this riverboat starred in a John Wayne movie.

The capitol city's oldest existing cemetery.

A working miniature city designed to teach kids about safety and presumably city planning.

A largely forgotten and touching neoclassical marble fountain overlooking a bear mound effigy.