The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

The first declared National Monument in the United States.

Inside this casino, visitors are treated to slot machines and a rare German Christmas pyramid.

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

One man's love for East Coast diner culture brought an entire eatery all the way from New Jersey to Colorado.

After being lost for nearly a century, this historic bell finally returned home after its mysterious theft.

A hotel with a rich Wild West history of miners and bootleggers.

An ADA-accessible trail and deck offering stunning views of Colorado’s Mount of the Holy Cross.

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

A mural of the Virgin of Guadalupe painted on the rock wall by canyon's religious namesake.

A unique arch graces the Dolores River Canyon near the Hanging Flume.

One of the few surviving Panama Canal steam shovels stands outside a tiny Colorado mining museum.

A remote sandstone plateau named for a legendary cattle rustler.

The site of a defunct mill, that once supplied marble for the construction of the Lincoln Memorial.

Neal Cassady may still have an open tab at one of Denver's oldest watering holes.

Historic, 19th-century wagon wheel ruts cut into soft volcanic ash.

A coal fire has been burning underground here since 1896.

The decaying ruins of a failed mining company’s water diversion project cling to the side of a desert canyon.

Once a lonely sentinel on the edge of the Great Plains, this rebuilt trading fort offers a glimpse of life on the Santa Fe Trail.

Two creeks flow out of either end of this canyon in opposite directions.

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

This restored farmhouse is a time capsule of a 19th-century Colorado homestead.

This old train trestle and collapsed tunnel once allowed the railroad to negotiate the steep slopes of the Colorado Rockies.