Hi JDE,
if you are interested in wandering the streets of almost photorealistic Victorian London covering 7 Boroughs, I recommend you "Assassin's Creed: Syndicate" (
http://blog.ubi.com/assassins-creed-syndicate-side-characters-locations-faq/). If you are capable playing action adventures (please no comments about this term) - fine, but if not, try using a game trainer to help the gameplay using cheats or simply download a 100% complete safe file and no crooks are bothering you any more and you are completely free to experience wonderfully detailed London covering huge area with working factories, foundries, forges, transport etc. and visit many well known landmarks also inside. After completing the game I used hours revisiting all those beautiful places with no rush.
Here is an in-game video sightseeing tour around different boroughs of London (
https://youtu.be/GmS_XU5dMhQ).
Timo