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

The largest drain hole in the world.

The site of murders and Satanic cult gatherings.

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

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.

With the touch of a button, you can read a randomly selected short story.

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

Abandoned bridge hidden deep in the San Gabriel Mountains.

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

Finale of "William Tell Overture" can be heard as drivers pass over grooves in the road.

This massive redwood tree has a hole in the base big enough to drive through.

Magical-looking cottages that inspired one of the most famous animated films ever.

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

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

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

This brightly made over hotel hides decades of suicide, serial killers, and mysterious deaths.

Eons old volcanic activity created one of the most stunning rock formations in the United States.

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

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.

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

Historic funicular railway, believed to be the shortest railroad in the world.

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

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