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They are Mecca, Medina, and Jerusalem.
Muslims do not worship any city. However, you may be asking which cities are holy for Muslims. The three most holy cities in Islam are Mecca, Medina, and Jerusalem.
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The three cities; Makkah (or Mecca), Madinah (or Medina), and AlQods (or Jerusalem); are considered Muslim holy cities.
Three cities are considered holy cities of Islam. Mecca and Medina are both located in Saudi Arabia. Jerusalem is located in Israel. All Muslims are asked to make at least one pilgrimage to Mecca.
The three main holy cities of Islam are: Mecca Medina Jerusalem
The Islamic religion has three holy cities: Mecca, Medina and Jerusalem.
Baghdad, Cairo, and Damascus
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Mecca followed by Medina (both in Saudi Arabi) followed by AlQods (Jerusalem) are the three Islamic holy cities for having respectively the three mosques: Almasjid Al-Haram, Almasjid Alnabawy, and Almasjid Alaqsa.
Mecca (or Makkah), Saudi ArabiaMedina (or AlMadinah), Saudi ArabiaEast Jerusalem, Palestinian TerritoriesThe three holy sites still controlled by Muslims
Jerusalem - Sacred to Muslims, Jews, and Christians.