This Boeing KC-97 tanker is now a restaurant for aviation lovers.

The largest dinosaur trackway in North America is tucked away among this canyon's ghosts and archaeological gems.

A recreation of an Old West apothecary full of curios.

This museum offers an actual time machine back through Colorado's past.

Travel through the wholesome amusements of yesteryear at this charming miniature village.

A small horde of mythical creatures lurk almost imperceptibly within the museum's wildlife dioramas.

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

The clock that sets them all.

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

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

The largest source of fossilized insects anywhere.

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

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.

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

This spectacular track has run continuously since 1882.

Abandoned silver mine strewn with wrecked and twisted structures.

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

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

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.

The largest self-built castle in the U.S., six decades in the making.

This naturally-sourced hot spring is now home to a clothing-optional resort.

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