Mummification body in Tower of Silence

A Tower of Silence or Dakhma is a circular, raised structure used by Zoroastrians for exposure of the dead. Zoroastrian tradition considers a dead body—in addition to cut hair and nail-parings—to be nasu, unclean, i.e. potential pollutants. Specifically, the corpse demon  was believed to rush into the body and contaminate everything it came into contact with, hence the Vendidad (an ecclesiastical code "given against the demons") has rules for disposing of the dead as "safely" as possible.

To preclude the pollution of earth or fire, the bodies of the dead are placed atop a tower—a tower of silence—and so exposed to the sun and to birds of prey. Thus, "putrefaction with all its concomitant evils" "is most effectually prevented."