I visited the Porta Nigra yesterday, the former Roman gate which was later turned into a church. As it was then repurposed in the early nineteenth century, it has become an historically confusing building. This was especially so as the former entry level for the church is now the first floor, but I was pleased to see this model in the Landesmuseum which made everything make more sense.
This is looking from what is now the main street of Trier, so the spire is on the left of the above photo that I took yesterday.
And this is looking from what would have been outside the city gate, with the former entrance of the gate blocked off.