The world's largest sticker ball weighs in at a mighty 231 pounds.

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

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

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

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."

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

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

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

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

This popular pilgrimage site offers a hole filled with holy healing dirt.

Life-sized sculpture of a blue whale made of hand-recycled plastic trash.

One of the American Southwest's most extensive collections of Navajo rock art.

This is one really big nut.

"I did this all while you were watching TV."

A clear blue swimming hole with hidden caves, still unexplored.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

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.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

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

This roadside stop between Goblin Valley is the perfect location to view some of the region's natural wonders.

This ancient cave is home to a museum, bar, and is filled with fluorescent minerals.