In Midan Ataba, 'modern European' Cairo runs up against the old medieval Cairo of Saladin (Salah ad-Din), the Mamluks and the Ottomans. It seems like one big bazaar, with all its traders and hawkers. In the southwest corner, the domed main post office has a pretty courtyard and an attached Postal Museum on the 2nd floor, whose collection tells the history of Egypt's postal service.