One of the largest Buddhist stupas in North America is built of concrete designed to last 1,000 years.

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

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.

The clock that sets them all.

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

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

Even in death, he's still your huckleberry.

Community owned and operated, this property is home to a diverse set of nudists.

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

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

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

A collection of fading fantasy tchotchkes lines this dirt road in the Colorado wilderness.

The scene of one of the darkest moments in American labor history has been left essentially untouched since the tragedy.

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

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

This museum offers an actual time machine back through Colorado's past.

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

A downtown park built on top of unclaimed graves.

At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.

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

The largest source of fossilized insects anywhere.

This deserted Gold Rush town is home to a Masonic lodge that, strangely enough, still holds meetings.

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."