The Zoroastrian Towers of Silence used to be burial sites, where the bodies were left laying in circles to be devoured by vultures, sun, wind and rain.
Tower of Silence - Wikipedia, the free encyclopedia
Tower of Silence - ( Dakhmeye Zartoshtiyan ) - Yazd - Iran
TOWERS OF SILENCE: ZOROASTRIAN ARCHITECTURES for the ritual of death
TOWERS OF SILENCE: ZOROASTRIAN ARCHITECTURES