The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

When zealous marijuana enthusiasts kept stealing the "Mile 420" highway marker, the State of Colorado got creative.

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

The clock that sets them all.

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

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

The largest source of fossilized insects anywhere.

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

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

See six states, pickled freaks, rocks, and antiques.

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.

This super steep hike ascends 2,000 feet in less than a mile.

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

This spectacular track has run continuously since 1882.

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.

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

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

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

Despite being one of the most photographed vistas in the Rockies these twin peaks are rightfully known as the "Deadly Bells."

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

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

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

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