Originally conceived as part of a proposed Arizona State Capitol building in the 1950s, this structure built in 2004 stands as a monument to the architect's legacy.

The site of the gruesome massacre—and maybe cannibalism—of five men, a tragedy that made Alferd Packer infamous.

Above Breckenridge, a destructive mining technique sits sunken in a small pond.

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

The temporary burial site of the man who shot and killed Jesse James.

This National Natural Landmark is one of the best examples of a “mass wasting” in the world.

In a dry, neglected cemetery lies the unassuming grave of a soldier vilified in life but celebrated in death.

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

The site of a minor battle might have been forgotten if not for one participant’s famous family and the death of a respected warrior.

A monument at the site of the Towner School Bus Tragedy, which lead to changes in school bus safety.

This marker identifies the location where three states converge.

This quiet chapel was central to a community of settlers who reclaimed an abandoned fort.

Visitors to this public park will also find the ruins of an old western fort.

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

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

A coal fire has been burning underground here since 1896.

The shattered remnants of a meteor that struck Santa Fe more than a billion years ago.

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

A remote sandstone plateau named for a legendary cattle rustler.

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

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

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

A river runs through this remote valley in a very unexpected way.

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