I watched and enjoyed it...
...and
after the programme (so this wasn't on my mind while I was watching), I discovered that the city, Cittàgazze, was not CGI but a plaster, wood and metal affair, built on a parking lot where the trailers used to be parked during the filming of the first series/season.
In
the article I read about it, production designer and executive producer Joel Collins said: “What’s interesting is it’s not just one big main street, which backlot sets sometimes are – it was a set to be lost in. I think that’s part of what I wanted to do. We were very lucky we had a central core, which was the tower. But I wanted everyone to be able to go down the street and get lost. If you can get lost in the street, then the camera can get lost – and you can suddenly make the town go from a certain size to massive.”
He then joked, “Sadly the crew started trying to live here, so we actually had to lock all the doors.”