A real time strategy game like Wargame or WARNO[1] but using REAL 3D map data from Apple/Google maps. So you could have a massive scale ground and air war using real map data in say, the south bay area. You could garrison an infantry unit in you house or call in an air strike on your office building. This is something I have wanted for like 10 years lol
Not a war game but the city builder strategy game Cities Skylines have an option to
import real terrain data from OSM. So say you can rebuild your own town for example
[1] https://store.steampowered.com/app/1611600/WARNO/