How many structures remain in mecca that date back to the time of Muhammad ?
Historic sites of religious importance which have been destroyed by the Saudis include five of the renowned " Seven Mosques " initially built by Muhammad 's daughter and four of his " greatest Companions " : Masjid Abu Bakr , Masjid Salman al - Farsi , Masjid Umar ibn al - Khattab , Masjid Sayyida Fatima bint Rasulullah and Masjid Ali ibn Abu Talib .