Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

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

This naturally-sourced hot spring is now home to a clothing-optional resort.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

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

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

An architect in Aspen used psychedelics as his muse while building this mushroom masterpiece.

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

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

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

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

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

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.

A recreation of an Old West apothecary full of curios.

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

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

A downtown park built on top of unclaimed graves.

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

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

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

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

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

Unlike most arches, this geological oddity formed in a volcanic dike.