Taking a journey into the Mayan underworld at Actun Tunichil Muknal, or the “Cave of the Stone Sepulchre”, will be one of the most enlightening, epic, and unique experiences of your life! Recently deemed the #1 Sacred Cave destination in the world by National Geographic, the ATM cave is not only beautiful geologically, with its crystalline stalactites and stalagmites, but also historically, as is a natural museum of ancient Mayan artifacts, as well as a sacred burial place. This is the final resting place of the “Crystal Maiden”, an ancient Mayan ceremonial victim.