The “Meta Sudans” was a fountain that stood next to the Colosseum. The remains of the core were demolished by Mussolini in the 1930s, so there are quite a few photographs around. Every so often I come across another.
Here’s one that I found on Twitter, published on 11 Jan 2018. It is unusual, because it shows the monument from an unusual angle, from the Palatine hill. Nice to have it!
From 1650, p 20, a wondrously exact French description & figure of the Meta Sudans https://books.google.ca/books?id=BRhlAAAAcAAJ&pg=PA20&dq=%22meta+sudans%22&hl=en&sa=X&ved=0ahUKEwjZndG-uMLcAhXeHjQIHdEZAsMQ6AEIKDAB#v=onepage&q=%22meta%20sudans%22&f=false
Thank you – I will post about this!