Those intrigued by rare underground worlds will delight in this video that takes the viewer to such uncommon wonders as New Mexico's Lechuguilla cave, which extends for many miles. It contains stalactites and stalagmites that offer their own special challenges. Viewers will enjoy watching as the mysterious darkness is illumined by the flashlights of the guides. The intricacies of a cave's food chain are explained, while unique fish and other life forms are spotted and examined. Ancient cave paintings are also shown. The footprints of past explorers remind viewers that caves have intrigued many for countless years. Interesting historical information is also included concerning past journeys into a number of well-known caves.