First used centuries ago, this unique form of whistle makes the haunting sound of a blood-curdling scream.
Archaeologists in Mexico have unearthed new sections of a terrifying structure made from human skulls.
500 years ago, a deadly epidemic known as 'cocoliztli' killed nearly 80 per cent of the Aztec population.
Archaeologists have unearthed a depiction of the mythical Aztec universe on the side of a volcano.
Archaeologists have located the site of a gruesome structure that was built from hundreds of human skulls.
Significant quantities of the metal have been found inside the Pyramid of the Feathered Serpent.
The discovery at Templo Mayor represents the largest number of skulls to ever be found in one offering.