Located in the south west corner of Greenwich Park, London.
"Queen Caroline was the estranged wife of King George IV, who lived at Montague House on the edge of Greenwich Park from 1798-1813.":
https://www.royalparks.org.uk/parks/greenwich-park/things-to-see-and-do/ancient-greenwich/queen-carolines-bath-remains
Date: early 19th Century
It can be compared to this scan by @nebulousflynn from 6 years ago: https://skfb.ly/CLSw
84 photos taken (by leaning over fence and hedge) in November 2020 with a Sony a6000 and processed in Reality Capture.