Golden Gate Park's historic collection of plants.

World's oldest operating science fiction and fantasy club, once home to Ray Bradbury and L. Ron Hubbard.

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.

Small museum packed with artifacts recovered by the man rumored to be the real-life inspiration for Indiana Jones.

The largest permanent Monopoly board makes one of the longest games even bigger.

In this century-old literary safehouse, print is alive and well.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

Explore 10 acres of environmental sculptures.

Beautiful Victorian buildings from L.A.'s forgotten architectural past.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

The programmatic glory of LA's giant whiskey barrel building has become an upscale reminder of the city's kitschy roadside past.

An outdoor sculpture park of giant pink robots and post-apocalyptic Christmas scenes.

A 300-ship graveyard, with a few still visible at low tide.

Historic marionette theater features thousands of handmade puppets and free cups of ice cream.

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

Stripes of flowers bloom each spring in a 50 acre rainbow of color.

Sister store to the Echo Park Time Travel Store.

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

A faux European lane smack dab in downtown L.A.

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

A spiritual retreat in the heart of Los Angeles offers stunning gardens and a labyrinth to lose yourself in.

A common entry point to the Griffith Observatory trail holds its own wonders.

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