Tower of Silence

A dakhma, also known as a Tower of Silence, is a circular, raised structure built by Zoroastrians for excarnation, in order to avoid contamination of the soil and other natural elements by the decomposing dead bodies. Carrion birds, usually vultures and other scavengers, consume the flesh. Skeletal remains are gathered into a central pit where further weathering and continued breakdown occurs.

Source: Wikipedia