Cave
5/5
Actun Tunichil Muknal (ATM Cave)
Actun Tunichil Muknal, widely known as ATM Cave or the Cave of the Crystal Sepulchre, is a sacred Maya subterranean site hidden deep within the Tapir Mountain Nature Reserve. World-renowned for housing calcified human skeletal remains, sacrificial pottery, and stone artifacts, it is infamous for intense spiritual activity and the glittering crystallized skeleton of the Crystal Maiden.