Mecca (Makkah al-Mukarrama or simply Makkah) is the main city of the Hijaz region (Saudi Arabia). It is the hometown of Muhammad and is currently the most important holy city of Islam. Millions of pilgrims visit it annually, since visiting Mecca at least once in their lives is one of the basic pillars of Islam. You have all the information in: «What are the main religions of the world?«.
You have all the information in: "What are the main religions of the world?".