The full horror of the Aztec 'skull tower' revealed: Archaeologists say THOUSANDS of human sacrifices had their still-beating hearts cut out before their heads were severed and added to a monument the size of a basketball court

  • Archaeologists previously found 650 skulls in Aztec capital Tenochtitlan, which became Mexico City
  • New research shows find was just a small part of massive array of what was once thousands of skulls 
  • New details of the gory rituals have also been revealed, which include turning skulls into masks