In a Moslem world there will be no traces of history prior to the time that Islam arose or was imposed, nothing outside of Islam. If Islam conquers all than knowledge and evidence that anything else ever existed will be effaced. The world will become semi arid sheep lands and desert with a a very small number of relatively opulent cities- where he rulers live and rule. The technology will continuously decline because nothing is added to it and things wear out and Mohammed did not use flush toilets, anyway.
Caliph Umar, destroyed the Alexandria Library shortly after the conquest of Egypt in 639 AD. The account states that the caliph, when informed about the institution, declared that if the books it contained agreed with the Koran, then they were superfluous, and if they disagreed, then they were heretical. In either event, they were worthless and should be obliterated.
Afghanistan Taliban Muslims destroying Bamiyan Buddha Statues