Fodor's Expert Review Onyx Cave

A less crowded alternative to Mammoth Cave, Onyx Cave has a variety of beautiful formations, including delicate crystalline draperies and rimstone pools. Stalactites, stalagmites, and other formations, including a 40-foot column, are highlights of this wet cave. There's a Native American burial ground, where the remains date from 680 BC. It also has a small gift shop on-site that sells rocks and fossils—you can even buy a bag of earth and pan for your own stones. Tours last 30 minutes.