Dozens of feral felines rule a segment of Hollywood's only graveyard.

The unedited photograph called "Bliss" has graced the screens of over a billion computers.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

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

Exotic feline breeding compound and conservation center.

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.

One of the ghostly stops along Route 66.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

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

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

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

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

The remains of the first punk club in L.A.

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

Towering basalt columns, a creation of fire and ice.

A hospital closed seemingly in the middle of operations, leaving behind fodder for horror films and ghost hunters.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

World's largest collection of serial killer artwork and other macabre exhibits.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

The "Seinfeld" diner.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.