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

Tubing through a cave lit with glowworms is a magical underground experience.

340 bicycles, 65 feet high.

An abandoned boat that's been stranded mysteriously for decades.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

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

A huge musical instrument played by the ocean.

San Francisco Bay's ghost town.

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

The only theatre in the world constructed specifically for sound movement.

A collection of memorabilia from the Beat era in the back of a San Francisco bookstore.

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

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

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

Barely visible foundations remain where Stow Lake’s “observatory” once welcomed visitors.

Olfactory delights in San Francisco's Botanical Gardens.

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 hidden subterranean installation offers a view of the sky.

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

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

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

Floating man-made island and upscale restaurant.

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

A psychedelic labyrinth on the San Francisco bay.