I have seen pictures of the surface of the Temple Mount covered with rubble around the time of WWI and the fall of the Ottoman Empire but could not find one today.
Here is a picture of Al Aqsa Mosque:
{above link} but this is after the 1927 earthquake; however it did take some years before the mosque was rebuilt.
There was no Muslim conquest of Jerusalem in the 600s
There was an Arab conquest of Jerusalem - and the Arabs were practicing a heretic form of Christianity that denied the Trinity.
These Arabs were the former vassals states of the Ghassanids and Lakhmids who fought for the Roman and Sassanid empires. When those two superpowers exhausted themselves, their former vassals walked in and took over.
Jerusalem was manned by a Byzantine garrison and this was captured after a siege - but note that
1. The Jews of the surrounding area supported the Arab conquerors
2. The Christians were slaughtered by the Arabs and the Jews
3. Christian writers who were IN Jerusalem at the time wrote of the place being conquered by Hagarenes / Saracens - i.e. by Arabs. There is NO mention of Muhammad, Quran, Islam, Muslims by these writers. Zero, nada, zilch.