A place of great reverence for Trekkies everywhere, a hero's future birthplace.

Dance on a hand-hewn log floor padded with bouncy boxcar springs at a saloon built in 1883.

This prison-turned-museum is a remnant of the Old West's grizzly, violent past.

A miraculous natural phenomenon known as "the spring that breathes."

An architect's childhood fantasy treehouse made real.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

A museum dedicated to the alleged Roswell Incident.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

A research lab and hands-on museum where visitors can experiment with retro technology.

Metal water storage tank turned ethereal concert hall.

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

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

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.

Rather than a run-of-the-mill franchise hotel, this lodging has been decked out in dinosaur decor.

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

Wall to wall taxidermy at Denver's oldest and most exotic steakhouse.

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

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

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

Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.