A popular tourist cave with a dark past.

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

A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

A ruined hotel with an unlucky history and an eerie present.

The neighborhood shop is a sort of tiny cactus museum full of exotic specimens you can take home.

One of the most unusual geological features, recognizable from a dozen hit movies.

An extensive collection of ancient Egyptian artifacts and mummies.

Ingenious bakery opens up the first Cupcake ATM at their flagship location in Beverly Hills.

The L.A. Zoo has a secret garden of rare bootleg cycads, a palm specimen dating back 280 million years.

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

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

The site of murders and Satanic cult gatherings.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

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

The largest drain hole in the world.

A meditative space out of a fantasy story.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

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

Carved by a waterfall in a hard-to-reach rock formation, this heart-shaped rock has inspired romantics for decades.

A look into the Church of Scientology's deeply unfavorable view of psychiatry.

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

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

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

Olfactory delights in San Francisco's Botanical Gardens.