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

A winding path built in secret on the edge of the continent.

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

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

A huge musical instrument played by the ocean.

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

Nose around a unique collection of more than 300 natural aromas used to craft perfume fragrances.

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

A free, public museum dedicated to the fascinating science of sight.

A psychedelic labyrinth on the San Francisco bay.

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

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

San Franciscans leave gifts and messages for the magical beings that live behind the tiny, mysterious door installed on a tree in Golden Gate Park.

Olfactory delights in San Francisco's Botanical Gardens.

The remains of a 12th-century chapter house in Golden Gate Park.

The stones that traveled from Spain to eventually become a holy place for San Francisco's nature worshippers.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

Its buzzing collection honors vibrator history.

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

San Francisco's newly reopened hands-on science museum.

With the touch of a button, you can read a randomly selected short story.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

A walk down memory lane in the heart of one of San Francisco's most notorious neighborhoods.

Spiral labyrinth hidden in the hills above Oakland, CA.