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

This once-popular otherworldly landscape was formed by one of the largest volcanic eruptions in history.

This interpretive path lets you get up close and personal with dinosaur bones.

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

In the middle of a suburban Denver neighborhood is a cave that once provided solace for a prominent Ute chief and his family.

A recreation of an Old West apothecary full of curios.

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

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

Even in death, he's still your huckleberry.

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

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

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

Colorado's only true geyser is hidden within the San Juan National Forest.

Carved by a waterfall in a hard-to-reach rock formation, this heart-shaped rock has inspired romantics for decades.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

A Jenga-style cylindrical tower of books that appears to go on forever.

Ruins of a German Castle on top of a towering stone pillar.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

Countless grotesque faces stare out from this eerie Prague art wall.

A whimsical village of unique treehouses resides in a Washington forest.

These eerie outliers of the lightning bug family glow a mysterious blue color.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.