Where is Zion (City of David, Salem, Jerusalem)

If we study Ezra & Nehemiah we can plot out the walls & gates. We can also follow the steps of David, 2Samuel15, on the Via Dolorosa. 1Kings6 describes completed temple. Can anyone look at the israeli national museum model and think it held more than 200 Roman soldiers? Acts23:23 gives a list of many more Roman warriors and equipage. What about the Dome of the Rock? Does anyone think this site was ever Ornan's threshing floor? 1Chronicles21:18 i want YOUR TOYS...UCH!!!