These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

Abandoned silver mine strewn with wrecked and twisted structures.

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

This spectacular track has run continuously since 1882.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

Colorado's only true geyser is hidden within the San Juan National Forest.

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

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

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

Once an unstoppable source of gold and silver, this town came to a grinding stop when the groundwater proved deadly.

The site where a nuclear bomb was lowered over 8,000 feet underground and detonated as an experiment in natural gas extraction.

Birds with backpacks expedite film development for a rafting company on a remote Colorado river.

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

Only a few signs remain of the buried Colorado mining town that supplied the uranium for the first atomic bomb.

This marker identifies the location where three states converge.

A focal point of in Denver’s skyline for over a century, inspired by a Venetian basilica.

This now-abandoned outcrop is an important Native American spiritual site, overtaken by European settlers and mining pollution.

The remains of a World War II-era Japanese American internment camp dot a windswept Colorado hill.

A prehistoric rock shelter that's literally in someone's backyard.

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

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

A coal fire has been burning underground here since 1896.

This once-popular otherworldly landscape was formed by one of the largest volcanic eruptions in history.

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