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.

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

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

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

Its buzzing collection honors vibrator history.

A psychedelic labyrinth on the San Francisco bay.

A huge musical instrument played by the ocean.

Accessible only at low tide, the deserted island is dotted with World War II ruins.