[jltsiren]

I think everything in the illustration is at least twice too high. The walled part of Bologna was ~1 km in diameter at that time, and the tallest towers were ~10% of that.

The model in Google Earth looks about right, at least if you compare it to this: https://static.bolognawelcome.com/immagini/ac/57/95/5d/20220...

[LtWorf]

The illustration is modern, by an artist.