This sacred cavern, 400 feet deep, is home to millions of bats and an ancient burial ground.

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

Mysterious glowing orbs float through the desert night.

This sidewalk tribute honors Colorado's great culinary creation.

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

A downtown park built on top of unclaimed graves.

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

See the sky in a new way through this art installation.

The final resting place of infamous outlaw Clyde and Marvin Barrow.

A mythical chimera first sculpted in 1936 as a mix of the main animals of Texas livestock.

A former electrical substation is now home to an eccentric junk art masterpiece.

The remnants of the base where US Army troops learned how to fight in extreme conditions.

A coal fire has been burning underground here since 1896.

This 19th century jail was mainly used to incarcerate the drunk and disorderly.

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

Each year, teams of the world's best snow sculptors have 65 hours to create frozen masterpieces.

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

A mental health hospital dating back more than 139 years, now features a museum.

At one time this small mining village was the highest town in America but now it sits abandoned while the mine churns on.

The remains of the dam that unleashed a 15-foot wall of water on Denver.

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

The moving metal works of one troubled artist can still be viewed on his front lawn... for now.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

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