Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."

Where scientists keep miles of very valuable ice from Antarctica and Greenland from melting.

This spectacular track has run continuously since 1882.

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

A little-known hot spring haven right below the highway.

Silver in the hills led to the speedy creation of this boom town and a lack of it saw the town abandoned nearly as quickly.

Abandoned silver mine strewn with wrecked and twisted structures.

An architect in Aspen used psychedelics as his muse while building this mushroom masterpiece.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

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

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

This modern antique shop is a museum for 1980's Saturday morning cartoon culture.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

A beautiful but deteriorating monument of Soviet architecture.

This extensive collection of vintage Soviet cars is the only one of its kind in the Caucasus.

Monks in the empyreal Alazani River valley have preserved their 1,000-year-old winemaking tradition.

The cave holds a spectacular array of stalactites and stalagmites, including one shaped like a giant human heart.

The last standing example of an ancient district's teatime tradition.

The second largest in the world, this massive underground void has its own subway.

The secret room where early Bolsheviks cranked out propaganda fliers on a smuggled printing press.

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

The decaying remains of a once-luxurious Soviet spa town.

A small but hugely whimsical theater where marionettes play out the "The Battle of Stalingrad."

Luxury hotel turned into a refugee camp, then turned back into a luxury hotel.