The largest riverfront opening cave in the Ozarks.

This small turbine mill along Rocky Creek was built in 1928

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

Often referred to as the largest spring in America.

The deepest spring in Missouri.

These pink granite water slides are the result of millions of years of erosion.

This former small town was destroyed not by the motor oil it sprayed the ground with but by the toxic waste that was added.

This historic cliffside mansion uses a natural cave for air conditioning.

This Italianate Villa-style castle is pretty to look at, just keep off the private property.

This mill has survived a tumultuous past to still produce flour and cornmeal.

Home to a seasonal waterfall and swimming hole in the Ouachita Mountains.

The seventh largest spring in the world.

A wild trout fishery in Arkansas.

This quirky Arkansas wax museum does not shy away from the macabre and the grotesque.

The Old Mill shown in the opening credits of “Gone With the Wind” is actually fairly new, and was never a mill at all.

The final remnant of the Arkansas zinc industry is this historically protected ghost town.

Largest man-made excavation on earth!

The highest peak in Utah is the hardest to reach, but only if explorers choose the hard way.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

An Ancestral Puebloan ruin that appears to burst into flames in the sunlight.

Despite sitting firmly in the global cradle of the Church of Jesus Christ of Latter-day Saints, this Hare Krishna temple is host to one of the largest color festivals outside India.

A tunnel with windows, so you don't miss out on the impressive views.

Hundreds of drawings left by the land's previous inhabitants remain mysterious.

Despite its name, this route in southern Utah offers a heavenly day trip.