Arg-e Bam is the largest city built in raw bricks in the world that has about 2200 years of age. This site is located above the Azarin hill, northeast of today's city of Bam. The surface of the ancient city of Arg-e Bam is about 20 hectares. Around the fortress there was a deep moat that over the centuries defended this urban complex from external assaults.
Among the structures identified in the city of Arg-e Bam there is a main gallery that in the past was a bazar, the remains of a Sasanian fire temple, a historic gymnasium of 'zur khane', public baths, stables, barracks, prisons and the 'Palace of the four seasons'. The common dwellings were built together and connected together. In some private houses the remains of private bathrooms are visible. The stables were located in areas separate from the houses.
Some houses had two floors and this shows that in one of the eras of the past there had been an increase in population. During the Islamic period two mosques were built, called the Friday Mosque and the Mosque of the Prophet Mohammad, and a 'Hoseiniye' (building for the commemoration of the martyrdom of Emam Hosein). The 'Four Seasons Palace' had three floors and was the seat of government, all orders and government rulings were issued by this residence.