This abandoned radar station from the Cold War era now only broadcasts a seriously ominous air of isolation.

Steam engines and conveyor belts are remnants of a genius system left in the middle of the Maine woods.

The remains of diamond fever taken over by the desert.

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

A small flooded ghost town with a few scattered structures remaining.

A giant gun barrel in Barbados that once hoped to shoot outer space with science.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

Medicinal spa created with the discharge from a geothermal energy plant.

A unique underground structure dating back to the 1st century BC.

A 70,000-square-foot institution dedicated to a very literal, creationist perspective on the Book of Genesis.

Thousands of well-dressed mummies below a monastery.

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

Overgrown ruins of a turn of the century island fort that sees very few visitors.

Last church of this militaristic WWII style.

Hut with supplies for shipwreck survivors.

The remains of a hospital ravaged by fire, once a progressive place of innovations for disabled children.

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The location of the last stand of Charles Manson's doomsday cult.

A picture-perfect town, perfect for blowing up.

Marking the spot where a conquistador gave up his search for the fabled Seven Cities of Gold.