The largest mosque in the world, it surrounds Islam's holiest place, the Kaaba. One of the Five Pillars of Islam requires every Muslim to perform the Hajj pilgrimage here, at least once in his or her lifetime if able to do so. Converted to mosque in 630.
Historically important for Muslims as it is the place where, after the Islamic prophetMuhammad received the command to change the direction of prayer (qibla) from Jerusalem to Mecca.
