When we say "the Old City of Jerusalem" we picture the Jaffa gates, the ramparts, The Holy Sepulcher Church, Via Dolorosa, etc. But the walls of what we know now as "the Old City" are actually not so old – they were build in the 16th century A.D., when Jerusalem was took over by Ottoman Turks and ruled by Suleiman the Magnificent.
Let's go deeper in history – to the tenth century B.C. This was the time when King David conquered the city of Jebus from Jebusites tribe, renamed it to Jerusalem and established it as the first capital of the United Kingdom of Israel. For the first time the twelve tribes of Israel are unified to one state. Just imagine, this was 3000(!) years ago. Two and a half centuries before Rome was even founded!
The real ancient Jerusalem – the City of David – is located just outside the Old City Walls, 5 minutes walk from the Dung Gate.