I have been in London a few times but never noticed.

What? Where are these semi-destroyed buildings left as monuments? I am not aware of any in London.

Mostly churches, it seems.

https://www.atlasobscura.com/places/the-ruins-of-st-dunstan-...

https://flickeringlamps.com/2015/03/06/the-ruins-of-christ-c...

https://beyondthepoint.co.uk/st-clements-church-blitz-damage...

Yeah sorry I was specifically referring to Christchurch Greyfriars. Basically it was as the article said, I was staying in the area (near uh a pub Samuel Pepys I believe) and was walking around and that was definitely one of the things that caught my eye. Maybe such things aren’t as common as I thought

I spent a bit of time in Budapest, something like 80% of the buildings were damaged during WWII and neglected behind the iron curtain afterwards. Even walking around today it is very common for a building to have a restored facade but a lot of historical damage on the sides.

> Also if you visit London you can go around and see a bunch of buildings they haven’t rebuilt and just left them in semi destroyed state as monuments

I lived in London for 20 years and never knew or saw anything like that?

The main thing you notice when you walk around London is the old/new mix. If you see a concrete monstrosity, nestled next to a Victorian/Edwardian/Elizabethan building, you're probably guaranteed that the newer building was built on top of a bomb site.

London bomb sites used to be frequent enough that they were backgrounds in 50s - 60s TV, such as The Professionals, but current economic success conditions have meant they've all been built over.