This historic national park is covered in the stunning ruins of red rock pueblos.

The Magical World of George Phar Legler.

The fading, forgotten remains of a once bright and booming factory.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

A reproduction of earth's many biomes.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Dramatic river bend surrounds a natural red-rocked pedestal.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A boulder so big and tough, they had to turn it into a landmark.

See 150 million-year-old dinosaur tracks and bones dating back to the Jurassic period.

An artist-run shop filled with art inspired by and made from nature.

A quiet rock and botanical garden is the beautiful centerpiece of Fort Lewis College.

For over a century, it has been a tradition to raise a flag at the top of this 450-foot sandstone pillar on the 4th of July.

A long and winding trail through history led to the current iteration of this mountaintop tower.

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

An environmental art installation inspired by farmhouses and crop circles.

On the edge of grassland in northeastern Colorado, these rock formations are some of the few remnants of a high plain that has eroded away over millions of years.

This fully restored synagogue explores the American Jewish experience along the old frontier.

A short but powerful waterfall resides amid Colorado’s Great Sand Dunes.

Take a self-guided tour through one of Colorado's most elevated mining districts.

In a small Japanese garden off a busy Denver street, a memorial to a brave, principled politician.

This Colorado fire station has been in continuous operation for more than a century.