A large sculptural artwork and garden in Escondido, California.

The memorial to the victims of the Jonestown Massacre carries the names of 918 lost, including one name people wish wasn't there.

The largest dune field in the Mojave offers a chance of hearing the 'singing sands.'

Home to secret Eastern Bloc spy equipment and the largest stretch of the original Berlin Wall outside of Germany.

The unbelievably opulent home built for an infamous newspaperman.

One of the last free public hot springs is decorated with hippie art.

An vast warehouse of everyday treasures in Berkeley, CA.

Celebrating the transformation of trash into objects of beauty.

360-degree virtual reality chamber physically immerses scientists into their data.

A small medical museum with a recreated doctor's office.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

World's largest collection devoted to one fruit.

Legendary prop shop filled with one man's collection of scientific curiosities.

The biggest pinball arcade in the world has over 600 pinball machines, and 300 arcade machines.

A playground built by the kids that is a child's wonderland, and a helicopter parent's nightmare.

A large instrument played by the wind.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

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

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

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

Located on 420 acres in the high desert, this spiritual center is dedicated to the "science of the future."

An extensive collection of ancient Egyptian artifacts and mummies.

A hidden subterranean installation offers a view of the sky.

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.