This infamous prison has a store where you can buy goods crafted by incarcerated people.

A hidden world of exotic succulents and cacti.

The overgrown ruins of a once thriving World War I-era copper mine.

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

This “living museum” at UCLA exhibits thousands of plant species from all over the world.

A popular tourist cave with a dark past.

"Only the devil could play golf here."

Named after a bandit and the star of several Hollywood prehistoric landscapes, these sandstone formations are a historical part of the Los Angeles natural landscape.

The quiet canyon has a tumultuous history involving a doomsday cult.

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

These millipedes glow not out of attraction, but as a not-too-subtle warning.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

The site of murders and Satanic cult gatherings.

The largest drain hole in the world.

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

An unfortunate geological resemblance to Satan has labeled this Pasadena gorge as a passage to the underworld.

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

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

"Looks so real, it's scary!"

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

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

Canyon walls shrouded in ferns.

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

One of the most scenic stretches of road in America winds between some of the country's oldest trees.