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

The memorial to the victims of the Jonestown Massacre carries the names of 918 lost, including one name people wish wasn't there.

A 19th-century shrine covered with prosthetic body parts as votive offerings.

Final resting place of one of the classic authors of horror literature.

A huge musical instrument played by the ocean.

An "anarchical" no man's land, complete with garbage sculptures and a hobo-run "Landfillian Library."

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

Depicting scenes of everyday life - and specific individuals - in Great Depression era San Francisco.

Once the largest windmill outside of Holland, with enormous 114 foot sails.

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

The remains of a ruined mansion memorialize the 1906 earthquake.

A monumental cross hides in the trees in Golden Gate Park.

A vast city of the dead, where the deceased outnumber the living by more than a million.

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

A quiet marker in memory of local men and women lost in WWI.

The restored and active Victorian-era final resting place of San Francisco.

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

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

A store that sells all manner of bones, insects, and animal curiosities.

A hidden subterranean installation offers a view of the sky.

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

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

A masterpiece in Golden Gate Park by virtue of the artist’s debt.

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