The ghostly remains of an accidental sea.

San Francisco's newly reopened hands-on science museum.

A hand-built folk art installation covered with messages of God's love.

The rocks in this arid basin leave trails of movement behind them.

Towering basalt columns, a creation of fire and ice.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

Ute tour guides have been sharing the ancient dwellings and rock art inside this large park with visitors for more than 40 years.

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

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

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

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

An antique narrow gauge railway line still running through the Colorado and New Mexico mountains.

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.

There are eight natural springs around town, each with a slightly different taste.

This spectacular track has run continuously since 1882.

When ecosystems collide in the arid Southwest.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

This sinkhole in the Arizona desert is filled with carbonated, arsenic-rich water