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Zoroastrian tradition holds that demons enter bodies upon death. The only way to purify these bodies is to give them to the birds.
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The outermost ring is for men, the second ring is for women, and the innermost ring is for children.
The bodies remain there for about a year.
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Over the course of that year, the corpses are baked by the sun and picked at by birds.
The bones are then placed in the ossuary pit below.
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That's where they ultimately rot and become one with the soil.
The towers are kept away from surrounding villages.
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It may seem like a bizarre practice to us, but is feeding your dead to the birds any weirder than burying them in the ground? Examining funeral rites gives us a fascinating look into the human race's obsession with death.
Source: http://www.creepybasement.com/tower-of-silence/