This document discusses 4 cities - Baitul Maqdis (Palestine), Madinah (Saudi Arabia), Istanbul (Turkey), and Rome (Italy) - that are centered around important places of worship. These cities developed around significant religious sites, with Baitul Maqdis centered on the Al-Aqsa Mosque compound, Madinah on the Prophet's Mosque, Istanbul on the Hagia Sophia, and Rome on St. Peter's Basilica in the Vatican.