A climbing route in the mountains of Italy’s Dolomites, built for soldiers during World War I.

Stalactites and stalagmites in a beautifully lit cave.

Fortified medieval tower house with lovely roof garden.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

The world's largest carnivore sanctuary is home to over 450 meat-eating rescues.

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

A downtown park built on top of unclaimed graves.

At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.

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.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

The highest bridge in America was built for an almost unnervingly small amount of money.

When ecosystems collide in the arid Southwest.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Inspired by a music box, a small town Vietnam vet carved an entire carousel full of animals by hand.

A monument to the egos of two railroad magnates that fell into decline along with their careers.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

An annual festival celebrating Colorado's most famous frozen corpse.

This angular Dwarven tunnel cuts through a mountainside in Glacier National Park.