Warning....... Do not image search for this if you are easily affected by decomposing human remains.
A Dakhma (Persian: دخمه ; Avestan: lit. “tower of silence”), also called a Tower of Silence, is a circular, raised structure built by Zoroastrians for excarnation – that is, for dead bodies to be exposed to carrion birds, usually vultures.
https://en.wikipedia.org/wiki/Tower_of_Silence