Shahr-e Rey, a 5000-year-old city, is a residential area in the south Tehran. It is richer than many other ancient cities in the number of its historical monuments, among which one might refer to the 3000-year-old Gebri castle, the 5000-year-old Cheshmeh Ali hill, the 1000-year-old Bibi Shahr Banoo tomb and Shah Abbasi caravansary. Rey is a great museum, which is covered with ancient monuments and sites, so that visiting Rey means stepping into the history. Its name dates back to the pre-Median era an used to be called "Rhagae". Some historians attribute its building to ancient mythological monarchs, and some others believe that Rey was the seat of a dynasty of Zoroastrian leader. In the past 4000 years Rey has gone through many ups and downs, floods and earthquakes. Rey proudly sourvived massive and destructive Arab and Mongolian invasions and plunderings, which left serious scars on its body. Rey was erected in glory much earlier than the modern city of Tehran, which was later constructed on its north. Tehran, whose definite date of construction is unknown, has just overshadowed Rey due to the extension of modernism and today's signs of civilization. in the course of history books and publications were pointing to Rey, but in the contemporary era the lack of references and information on this ancient historical and religious city is quite evident.