London Bridge

Spotted whilst walking from St Pauls to the Tower of London. This arch is the remnants of the pedestrian entrance to the old London Bridge. I'd read about it before and wanted to see it so I was quite pleased to unexpectedly spot it as we walked past. 
https://www.historic-uk.com/HistoryMagazine/DestinationsUK/Remains-of-the-old-London-Bridge/