Definition of Actun tunichil muknal

As a Maya archaeological site, ATM is notable for its skeletons, ceramics, and stoneware. The most famous of the human remains is known as "The Crystal Maiden". It is the skeleton of a teenaged girl, probably a sacrifice victim, the bones of which have been completely covered by the natural processes of the cave, leaving them with a sparkling appearance. There are several such skeletons in the Main Chamber.