I just finished watching a set of 3 videos on Amazon Prime called Italy's Invisible Cities. Very interesting, they use scanning technology to show us underground and inside of buildings in Naples, Venice, and Florence. Lots of good history and views of the cities. They were done in 2017, so are fairly recent. I thought they were very well done and entertaining.
If you don't want to pay for Amazon Prime you can just watch them for free on YouTube:
Episode 1: Naples
https://www.youtube.com/watch?v=ed8eCwHWOVY
Episode 2: Venice
https://www.youtube.com/watch?v=ez0ZRV2V7gk
Episode 3: Florence
https://www.youtube.com/watch?v=PwPOwLbsZq0
Wow, thanks Kathy H and Andrew H. Bookmarking for later.
We watched these because of your post and enjoyed them very much. Thanks for taking the time to post.