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The Kaaba in the centre of the Masjid al-Haram in Mecca, Saudi Arabia, circa 1979. Every year, millions of Muslims complete a hajj or pilgrimage to this sacred spot. (Photo by Keystone/Hulton Archive/Getty Images)

The Kaaba in the centre of the Masjid al-Haram in Mecca, Saudi Arabia, circa 1979. Every year, millions of Muslims complete a hajj or pilgrimage to this sacred spot. (Photo by Keystone/Hulton Archive/Getty Images)