An underground river pushes more than 200 million gallons out of this Missouri spring every day.

A 40-foot waterfall flows into this unique natural swimming hole.

Exploring the past, present, and future of blues music.

The largest collection of woven silk tapestries in the world.

The oldest soda fountain in St. Louis has been serving up treats for more than a century.

In eastern Oregon, two mineral hot springs sit along the Malheur river.

An excursion train traverses a picturesque red-rock canyon along the Verde River.

Red sandstone structures dominate this landscape, which has been inhabited for some 5,000 years.

One of the best-preserved ghost towns in Arizona speaks to the difficulties of establishing mining towns in the 19th century American West.

Archaeologists believe this panel of petroglyphs depicting descending sheep and other figures in Glen Canyon are 3,000 to 6,000 years old.

A colony of Mexican free-tailed bats live under the bridge and take flight at sundown all summer long.

This now-abandoned part of the original transcontinental railroad route provides a surreal driving and historical experience.

This prehistoric karst cave is situated near a working ranch and historic warm springs.

Nature has shaped this drainage tunnel into the digestive tract of a mighty beast.

The narrow mountain road that carves a path between Florence and Victor is tied to ghost towns and ghost stories.

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.

This remote Colorado canyon is home to the second-largest collection of natural arches in the world.

Located in the world's highest-altitude Dark Sky Community, this observatory welcomes amateur and professional astronomers alike.

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

The remnants of a 1970 plane crash remain high in the Rocky Mountains.

A multiversal transit station located right below a highway interchange.

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

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.