A coal fire has been burning underground here since 1896.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

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

The remnants of the base where US Army troops learned how to fight in extreme conditions.

This massive home was constructed by one of the greatest conservationists in Colorado history.

Located in the world's highest-altitude Dark Sky Community, this observatory welcomes amateur and professional astronomers alike.

A memorial dedicated to the victims of the Columbine High School shootings.

This three-mile concrete levee in Pueblo, Colorado was transformed into the world’s longest painting.

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

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

Victorian "Fancy Craft" Hair Wreaths and Relics.

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