A pair of parish boundary markers in Kensington Gardens, Hyde Park, London. They mark a boundary between Paddington(?) and Marylebone(?) parishes.
They are mistakenly sometimes referred to as the "Peter Pan graves" or "tombstones of Walter Stephen Matthews and Phoebe Phelps" due to the letters PP on one of the stones.
https://londonist.com/2013/09/the-secret-stones-of-kensington-gardens
145 photos taken in September 2020 with a Sony a6000 and processed in Reality Capture.