Once a place of peaceful repose, this sanitarium now faces an uncertain future.

An abandoned asylum once on the cutting edge of lobotomies may be reborn as a Christian college.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

This crumbling industrial fortress has attracted daredevils, filmmakers, and historians.

No monkeying around, this fountain was really named after the classic sci-fi film.

Replica of an old Esso filling station, complete with Wayne gravity pump and outhouse.

A hidden tunnel leads to an abandoned slate quarry that's now a secret swimming spot guarded by cliffs.

Recognized the world over as the home of the McCallisters in the 1990 movie "Home Alone."

The blinking light atop the iconic landmark has been sending secret messages for decades.

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

This mysterious twin turboprop Grumman G-159 covered in graffiti has spent a decade and a half abandoned.

This crucial gathering spot along the "hippie trail" still displays old notes between traveling beatniks and backpackers.

Why settle for barbecue chips when you can get actual barbecue?

A beautiful 19th-century mansion slowly crumbled and became a 'ghost house' after World War II.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

A painfully obvious spy house sits right across the street from the Russian Embassy.

An out-of-place Air Force radar dome is all that denotes this park as a former missile launch site.

The set location for a 1987 cult classic draws international film buffs to the middle of the Mojave Desert.

Fourteen curious and controversial white bunnies sit in a circle near Newport Beach City Hall.

A swing to dangle you off the very edge.

This tiny square mile of Canadian sand was once considered the world's smallest desert.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

A forest of immensely tall and unusually straight oak trees planted nearly 200 years ago to build naval ships that never came to be.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.