How many structures remain in mecca that date back to the time of Muhammad ?
Other historic buildings that have been destroyed include the house of Khadijah , the wife of the Prophet , the house of Abu Bakr , now the site of the local Hilton hotel ; the house of Ali - Oraid , the grandson of the Prophet , and the Mosque of abu - Qubais , now the location of the King 's palace in Mecca .