A flat slab of stone perched hundreds of feet above the Gasconade River in the northern Ozark mountains.

Away from the crowds of fishing enthusiasts, take a hike deep into the woods and journey into an eerie darkness.

First crafted during the 19th century, the mill was fully restored in 1983.

The only mill in the state that features a covered bridge.

From a canyon-like gorge, more than 20 million gallons of water emerge every day, while a smaller spring drips down, creating the illusion of an endless, gentle waterfall.

Come for the heirloom-corn whiskey, stay for the wood hats.

This small turbine mill along Rocky Creek was built in 1928

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

Some of the oldest exposed rock formations in the United States.

Around 50 million gallons of water flow from this spring every day.

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

Entombed in this strange, white stone hill are the deadly remains of radioactive weapons production.

A mysterious light of unknown origin on the backroads of Missouri.

A geological oddity formed by two rivers carving out a mass of limestone on both sides.

This underground cave located in the most barren reaches of Idaho is filled with ice year-round.

It was once used as a classroom to teach mining skills to local high school students.

A mining town, now abandoned, was built in a canyon so narrow that the railroad ran right through the hotel lobby.

Natural rock water slides hidden in the remote forests of northern Idaho.

These petroglyphs created by ancient Arizonians have withstood centuries of exposure to the elements.

Two geoglyphs that are truly unique to North America.

This Native American settlement dates back to the Pueblo II period.

Petroglyphs, bird watching, and a 100-year-old Ranch in one location.

Some 10,000 works of ancient rock art cover these volcanic basalt outcrops near the Gila River.

This comprehensive collection features Native American artifacts dating back centuries.