 It has been reported that there are now fewer than 20 structures remaining in Makkah that date back to the time of Muhammad.Some important buildings that have been destroyed include the house of Khadijah, the wife of Muhammad, the house of Abu Bakr, Muhammad's birthplace and the Ottoman-era Ajyad Fortress.The reason for much of the destruction of historic buildings has been for the construction of hotels, apartments, parking lots, and other infrastructure facilities for Hajj pilgrims.