The site of a defunct mill, that once supplied marble for the construction of the Lincoln Memorial.

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

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

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

Even in death, he's still your huckleberry.

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

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

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.

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

Possibly the world's only drive-in movie theater with an attached motel.

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

A short tunnel built straight through a magmatic dike.

A chessmaster's dream destination.

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

This is not your typical jungle gym.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

This majestic tree has survived 400 years of storms, droughts, and floods, and is a beloved natural landmark in Missouri.

See the motorcycles that launched the stuntman to fame and the gear that saved his life.

This tiny old water tower once doubled as a makeshift jail.

This historic railroad hotel built from Kansas limestone was once the most popular hotels for traveling salesmen in the midwest.

A 20-foot-tall egg painted in a traditional Czech patterns by the Czech community in Wilson, Kansas.

Less a museum than a bizarre fantasy world created by artists and engineers.

One of the Eight Wonders of Kansas and the first official National Natural Monument these stark formations look like nature's Stonehenge.