While made famous by the ancient Egyptians, mummification is a process not just confined to their afterlife culture, as any corpse which has had its skin or organs preserved thanks to external chemicals, substances or extreme temperatures is classed as a mummy. Indeed, mummified corpses have been found all over the Earth, from Russia to the Americas, often preserved in desert or ice environments, with many of them showing evidence that the person had been sacrificed as a deity offering. The ancient Inca culture ritually sacrificed women and children to appease their god and many examples of this have been found at the peak of mountains and under the ground, two of the traditionally held entrances to the spirit world.