Hundreds of drawings left by the land's previous inhabitants remain mysterious.

This set of three large, volcanic hot springs is a favorite haunt for intrepid divers.

This former office building has been transformed into an immersive music venue and art space.

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

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

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

Metal water storage tank turned ethereal concert hall.

This remote Colorado canyon is home to the second-largest collection of natural arches in the world.

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

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

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.

One man has installed bathtubs into the Utah desert floor to harness the powers of a natural hot spring.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

An absolutely beautiful 200-foot stained glass installation traces the evolution of knowledge.

This geothermal hot spring hides beneath a slowly growing mineral dome.