An antique narrow gauge railway line still running through the Colorado and New Mexico mountains.

The site of the "Bone Wars" between two rival paleontologists during the dinosaur rush of the 19th century.

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

Toss a Frisbee through the ruins of this Colorado gold mining town.

Hidden beyond a kitschy giant beetle is this remarkably sprawling collection of preserved insects.

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

This grand stone tower was dedicated to a famed American humorist almost by coincidence.

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

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

An annual festival celebrating Colorado's most famous frozen corpse.

This iconic science fiction house still looks like something from the future.

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

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

A recreation of an Old West apothecary full of curios.

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

The wreckage of a World War II bomber is hidden high in the Colorado wilderness.

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

The largest source of fossilized insects anywhere.

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

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

When ecosystems collide in the arid Southwest.

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

The largest self-built castle in the U.S., six decades in the making.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."