The ravine where Jesse James supposedly performed an impossible jump to evade capture.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

These curious caverns have been home to mushrooms, gangsters, and disco.

This large midwestern cavern features impressive rock formations and an underground waterfall.

Half of a waterfall goes into the river while the other half seems to disappear.

World's largest carved onyx figure stands as a tribute to enduring peace.

This posh mansion began as a family's estate and ended as the site of a murder ripped from the pages of a pulp novel.

At this Minnesota state park you can easily wade across the source of the mighty Mississippi.

European castle ruins in an American state park are actually the product of death and grief.

The only freestanding table rock formation east of the Mississippi.

Thousands of unique minerals, including some of the most impressive fluorite crystals in the world.

Patrick Dougherty's fantastic living tree sculptures, mind-blowing but temporary.

A humble homemade ride attracts visitors from around the globe to this small Midwestern town.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

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

River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

An enormous natural sandstone bridge in Kentucky.

Another in a long tradition of legends regarding infernal seats.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

Eclectic collection of rare and beautiful stones in a historic home.

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

Erosion and time have created a naturally-formed water park.

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.

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