This interesting item was posted on Twitter here.
Photographs of the Meta Sudans are always welcome. This one is at an unusual angle and indicates that the destruction facing the Colosseum was not flat 180°, as it often appears in photographs, but nearer 150°.
The photographer, the Rev. John Shaw Smith, was an Irish clergyman who travelled in the Mediterranean around this time over a period of a couple of years, in the relaxed fashion of the day. Photography was new, and everything he took is probably valuable.
There must be a wealth of photographs and other material in Italian archives, but sadly inaccessible. Google increasingly is turning into a commercial portal instead of a search engine, so I doubt this will improve soon.