This magnificent arch is all that remains of a former smelt mill.

A mountaintop space observatory that is certified dark.

A fiery crater has been burning in the Karakum Desert since 1971.

The ruins of a resort and casino sit on the banks of this blue hole spring that pumps 70,000 gallons of warm, clear water every minute.

An abandoned fish-shaped drive-in gets a second life as a restaurant.

In the mountains of West Virginia is this perfectly preserved Art Deco train station.

One of the few surviving original NASCAR dirt-track speedways.

Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.

The lighthouse central to the 1980s horror classic "The Fog" is, in fact, located in one of the foggiest areas of the Pacific Coast.

Don't be surprised if you see a long-necked dinosaur peeking out from among the trees in Northgate Park.

Part of a highway network meant to connect Miami to Montreal, this 10-mile stretch of road made from red bricks is still around 100 years later.

This stimulating sex toy museum is sure to arouse the interest of its visitors.

An abandoned castle owned and ignored by Masons carries a cursed history.

European castle ruins in an American state park are actually the product of death and grief.

The ruins of a Florida miracle spring resort make it seem like a wonder that this was ever a health spa.

These mouldering mansion ruins remember a time when the Catskills were nothing but luxury.

The walkable ruins of an 19th century hotel, destroyed in a horse cremation gone wrong.

One lonely, modern pyramid has gone from corporate think tank to deserted boondoggle.

It was an experiment to prove that glacial boulders and rocks can be used in constructions and dwelling.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

A true treehouse near Hawai'i Volcanoes National Park.

This former luxury resort in Kaua'i is now an abandoned relic.

This tiny Hawaiian island is slowly coming back to life after being bombed during naval training exercises.

The grand marquee of this abandoned Hawaiian theater remembers the building's elegant past.