(This is a list question with many possible answers. Mirroring the meta proposal for references I'm making this is a community wiki - please feel free to edit to add more examples.)
- Wàn Sōng Temple, China - Semaphore
- Abbey of Monte Cassino, Italy - SJuan76
- Reims Cathedral, France - gdir
- Various actions on the Eastern Front of WWII - Fedor Nazarov
(see the non-wiki answers for details on each answer)