On This Day: The Muslim conquest of Mecca in 630 CE
Mecca, Saudi Arabia, is home to Masjid al-Haram, the largest mosque in the world which has within it the Ka'ba toward which all Muslims pray.
Muslim pilgrims pray around the holy Kaaba at the Grand Mosque ahead of the annual haj pilgrimage in Mecca on September 21, 2015(photo credit: REUTERS/AHMAD MASOOD)