The 13 Crystal Skulls

Crystal Skull 1: Overture Crystal Skull 2: Ghosts of the Aztecs Crystal Skull 3: The Cave Crystal Skull 4: Ceremony in Tenochtitlan Crystal Skull 5: Carved Legend Crystal Skull 6: Watching Eyes Crystal Skull 7: The Shaman‘s Lore Crystal Skull 8: Refraction Crystal Skull 9: On the Hills Crystal Skull 10: Excavation Crystal Skull 11: Ghosts of the Maya Crystal Skull 12: Through the Ages Crystal Skull 13: The Lost Artifact