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.

The largest riverfront opening cave in the Ozarks.

An average of 33 million gallons of water pour out of the collapsed cave at the heart of this spherical spring.

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

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

Often referred to as the largest spring in America.

The deepest spring in Missouri.

Three markers installed over the course of 140 years mark the point where Arkansas, Missouri, and Oklahoma converge.

In the St. Francois Mountains in the Ozarks at 1,772 feet above sea level, Taum Sauk Mountain is the highest (and possibly oldest) peak in Missouri.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

Curious cave that stays a cool 56 degrees all year long.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

The world's longest known cave system.

Yup, that's where the name came from.

Where animatronic singing fish go to retire.

A 24-hour vending machine restocked daily with homemade full-sized pecan pies.

An emerald-green grotto just a short trip from Austin.

This Little Rock legend has survived decades of rowdy crowds, three fires, and a zombie wedding.

In Paris, Texas they have their own Eiffel Tower, it just has a cowboy hat on it.