As an object, skulls are powerfully symbolic. An ancient Indiang legend said that there were 13 crystal skulls of the Goddess Death, and that they had to be kept separate from each other and hidden throughout history.
Archaeologists (and paranormal hunters, ok maybe mostly paranormal hunters) have discovered a few of them:
First, art critic Frank Dordland started investigating the strange skull. After a closer investigation, he discovered that the skull had a complicated system of lenses, prisms, and channels, creating unusual optical effects. The investigator was surprised to discover no signs of processing on the skull's perfectly polished surface. They couldn't be seen even with a microscope. Frank Dordland even addressed Hewlett-Packard, the famous company that specialized in crystal oscillators at that time, for a competent examination of the crystal. ...