Mayan Blue

Xibalba, home of torture and sacrifice, is the kingdom of the lord of death. He stalked the night in the guise of a putrefied corpse, with the head of an owl and adorned with a necklace of disembodied eyes that hung from nerve cords. He commanded legions of shapeshifting creatures, spectral shamans, and corpses hungry for the flesh of the living. The Mayans feared him and his realm of horror. He sat atop his pyramid temple surrounded by his demon kings and demanded sacrifices of blood and beating hearts as tribute to him and his ghostly world.
These legends, along with those that lived in fear of them, have been dead and gone for centuries. Yet now, a doorway has been opened in Georgia. A group of college students seek their missing professor, a man who has secretly uncovered the answer to one of history's greatest mysteries. However, what they find is more than the evidence of a hidden civilization. It's also a gateway to a world of living nightmares.