A waterfall 600 ft. inside a mountain, once the bane of gold miners, is now a spectacle of nature.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Only museum dedicated to women pilots, with personal artifacts from Amelia Earhart and other aviatrixes.

This off-the-beaten-path abandoned town is a relic of Montana's silver mining boom.

A tribute to the "toughest woman on the Texas frontier," who survived a famous battle and five husbands.

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

A seven-story 1920s mausoleum outside Denver houses thousands of remains.

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

Curios, scientific antiques, oddities for sale.

A focal point of in Denver’s skyline for over a century, inspired by a Venetian basilica.

While comics are the main attraction at this megastore, the second floor plays host to an exhibit fit for a museum.

It's easy to forget what century it is as you wander this rustic homestead.

This Chinese-style quartz sundial was saved in its final hour.

This was once the home of Gahan's Saloon, Denver's most storied speakeasy.

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

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

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

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

One of the greatest heroes of the Titanic tragedy came from humble beginnings to this beautiful home.

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

A downtown park built on top of unclaimed graves.