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First used centuries ago, this unique form of whistle makes the haunting sound of a blood-curdling scream.
3
Archaeologists in Mexico have unearthed new sections of a terrifying structure made from human skulls.
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500 years ago, a deadly epidemic known as 'cocoliztli' killed nearly 80 per cent of the Aztec population.
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Archaeologists have unearthed a depiction of the mythical Aztec universe on the side of a volcano.
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Archaeologists have located the site of a gruesome structure that was built from hundreds of human skulls.
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Significant quantities of the metal have been found inside the Pyramid of the Feathered Serpent.