This unlicensed collection of fast-food memorabilia sits on the site of the first ever McDonald's restaurant.

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

Stroll the grounds built by murder, suicide, and dirty oil money at one of Hollywood's most filmed mansions.

This private residence was the template for one of the most beloved television homes of all time.

The abandoned personal amusement park of the King of Pop.

San Francisco Bay's ghost town.

The unbelievably opulent home built for an infamous newspaperman.

One of the ghostly stops along Route 66.

San Diego's most historic and haunted home.

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.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

The remains of a ruined mansion memorialize the 1906 earthquake.

The largest drain hole in the world.

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

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

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

An inconspicuous footbridge beloved by San Diego locals.

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

A spiritual retreat in the heart of Los Angeles offers stunning gardens and a labyrinth to lose yourself in.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

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

World-famous, Pink's still manages to keep its prized cult fetish status.

Left untouched since a double murder-suicide in the 1960s, Los Feliz murder mansion remains a neighborhood mystery.

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