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.

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.

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

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

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

A collection of 20th-century automata, penny arcade games, and musical contraptions.

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

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

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

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

A crumbling wizard is one of the final reminders of a roadside Middle Earth.

The mysterious round rocks of Schooner Gulch.

Nursery with extensive collection of flesh-eating plants operated by the author of "The Savage Garden."

The haunting ruins of Jack London's dream house.

The short-lived railroad town in central Oregon has been abandoned since the 1930s.

A grove of "candelabra redwoods" deep in California's Lost Coast.

Canyon walls shrouded in ferns.