The Black Stone at the Kaaba, Mecca, Saudi Arabia - revered by Muslims as an Islamic relic, which according to Muslim tradition dates back to the time of Adam and Eve. Originally set intact into the Kaaba's wall by the Islamic Prophet Muhammad in the year 605 A.D., five years before his first revelation. The Kaaba is the holiest site in the Islamic World and a place of pilgrimage attracting many millions of Muslims each year from all over the world. Considered desirable that each Muslim should make the Hajj (pilgrimage) at least once in their lifetime. To Muslims the Kaaba is considered the centre of not just the world, but all Universes.