A copper octagonal structure at the west end of Westminster Bridge, London (near the boat pier) used for recording the river depth at this location. If you look through the little windows you can see the digital displays of the recording equipment.
The box is covered in stickers and other graffiti.
Museum of London explanation:
https://www.youtube.com/watch?v=YJyaIK_ILZI
186 photos taken in July 2020 with a Sony a6000 and processed in Reality Capture.