The world’s longest known cave system is Mammoth Cave with more than 400 miles of passageways (2X the next closest, Sac Actun underwater cave). The name refers to the mammoth size of the rotunda at the cave’s entrance and has nothing to do with wooly mammoths as often assumed.

A variety of cave tours show off Mammoth Caves top features and highlights, including the sheet of dripping rock known as Frozen Niagara, Grand Avenue,and Fat Man’s Misery.

Above ground the Green and Nolin Rivers run through Mammoth Cave National Park, providing an entirely different world of adventurous options including hiking, biking, boating, and fishing.