The Tower of Silence in Rey is where Zoroastrians exposed the corpses of their dead to the sun. This six-meter high structure is made of stone and mortar and dates back to the first millennium BC.
Zoroastrians lived in this area, who used to leave the corpses of the dead in the open air usually on a structure known as a Dakhma (Persian: دخمه) or Tower of Silence. According to their traditions, once the flesh had decayed, the remaining bones would be buried. The ancient Zoroastrians disapproved of contaminating the earth (Zam) with a corpse through regular burial, or contaminating fire (Atar) through cremation (An afront to Armaiti and Asha respectively) due to the belief that corpses are nasu (unclean and impure). Gebri crypt was built as a high circular structure, six meters high, which was constructed by stone and mortar. It dates back to the 1st millennium BCE, around 3,000 years ago and was earlier called by different names, such as Khamoushan tower, Ostvaran, Ostkhan-ran, Marg (Death) tower and Sokout (Silence) tower.