they guy who told me about them is a bartender at this hotel, and he said they might be a kind of computer which was made to share ancient wisdom.The most famous skull is called the skull of doom . he said tests on a skull by the British museum found the one they have must have been made in the late 19th century , so it's a fraud for sure but he thinks others might be real. do you remember that movie that came out in 2008 - Indiana Jones and the kingdom of the crystal skull? great, wasn't it? but i'm not sure if i believe the story