The Actun Tunichil Muknal (Cave of the Crystal Sepulchre) is a sacred cave located near Sa Ignacio, Cayo District, Belize. This place is known as a Maya archeological site that incases skeletons, ceramics, and stoneware. It was a cave used by the Mayans for sacrificial reasons. The most known skeleton in the cave is known as The Crystal Maiden. It's possible that they were a sacrifice victim, and the conditions of the cave allowed the bones to calcify giving the body a sparkling and crystallized appearance.
The Crystal Maiden was originally believed to be a woman around 18-20, but it's now believed that the body may belong to a teenage boy. It's believed that they died between 700 and 900.
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