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Mecca is a city in Saudi Arabia and the most important city to Muslims. The reason for that is that the prophet Muhammad proclaimed Islam there in the 7th century. He preached to the people of Mecca just to pray to Allah and to convert to Islam. He and his followers emigrated to Medina in 622 because of persecution.

Mecca ©Flickr Al Jazeera English

The pilgrimage to Mecca, called Hajj, is one of the 5 pillars of Islam and it says that every muslim who is able and can afford must make the pilgrimage for at least once in the lifetime. Therefore, millions of pilgrims come to Mecca each year. Most Pilgrims want to see the Kaaba.