In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

An eatery for UFO seekers on the Extraterrestrial Highway.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

This abandoned lighthouse looks like a rusting oil rig, but has managed to survive a number of storms.

Abortion, prohibition, religion, war, and fear all play a part in the history of this idiosyncratic Pacifica castle.

This TV tower once secretly housed a GDR intelligence team.

The sea once considered an ecological wasteland is now called "crown jewel of avian biodiversity" by scientists.

A ruined hotel with an unlucky history and an eerie present.

Cows on a ranch are commonplace, scattered cow bones everywhere? Not so much.

Over 300 taxidermied animals in a Californian restaurant make for a taxidermist's dream and an animal lover's nightmare.

These millipedes glow not out of attraction, but as a not-too-subtle warning.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

A beautiful geyser under environmental threat.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

An architect's childhood fantasy treehouse made real.

Half of a waterfall goes into the river while the other half seems to disappear.

Eternal resting place of the grave robber and murderer who served as inspiration for many of cinema’s famous madmen.

This large midwestern cavern features impressive rock formations and an underground waterfall.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

Gambling, boozing, and yodeling animals cover the walls of this dive bar cum natural history museum.

An unusual assortment of art, furniture, and other curiosities.

A museum within a museum, devoted to history's most questionable medical devices.

This taxidermic smorgasbord was co-created by an artist poached from the Museum of Natural History.

One man's love of natural beauty led to the creation of this hidden granite monument.