Like Stonehenge, but with boats and oodles more charm.

A cave 150 feet beneath Kansas City is the perfect climate for growing 10,000 delicate orchids.

A floating museum that was sunk by a flood and left to rot in the tides.

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

A subterranean haunt where wine and homemade biscottis are always on the menu.

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.

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

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.

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

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