These decaying bridges 1,000 feet high are a reminder of the skill it took to cross the Colorado Rockies by rail.

Community owned and operated, this property is home to a diverse set of nudists.

A collection of over 15,000 zines works to preserve DIY publishing culture.

The scene of one of the darkest moments in American labor history has been left essentially untouched since the tragedy.

The world's largest key collection features keys to the White House, Frankenstein's castle, and Hitler's bunker.

The largest source of fossilized insects anywhere.

The childhood home of Henry Jones Jr. is now an adventure-themed bed and breakfast.

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

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

Colorado's only true geyser is hidden within the San Juan National Forest.

When ecosystems collide in the arid Southwest.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

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