saudi arabia, and specifically mecca and medina, in hejaz are the cradle of islam, and the pilgrimage destinations for large numbers of muslims from across the islamic world. one of the king's titles is custodian of the two holy mosques, the two mosques being al-masjid al-haram in mecca, which contains islam's most sacred place (the kaaba) and al-masjid an-nabawi in medina which contains muhammad's tomb.