One of the world’s largest collections of petroglyphs records 2,000 years of human activity.

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

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

A replica that won't float away.

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

A sculpture for the sun and stars, created by Nancy Holt.

Largest collection of mounted dinosaur specimens in the world.

Dig for your own trilobites in this goldmine of invertebrates.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

Sandstone rock formations that look like they belong on the cover of a progressive rock album.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

This concert pavilion on the shore of the Great Salt Lake has been destroyed by fire, water, and disinterest but keeps coming back.

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

Take a dip in the world's largest mineral hot springs pool.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

Colorado's only active volcano last erupted around 4,000 years ago.

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

A riverside tiny house with books and other treasures galore.

Two tall rocks sit at the center of this site, once the home of a large Ancestral Puebloan community.

A glimpse of a waterfall is reached by a steel catwalk along a slot canyon located in an Ouray city park.

A little-known hot spring haven right below the highway.

A coal fire has been burning underground here since 1896.

The giant stump of the once towering cottonwood where Ute people held tribal meetings.