Maybe Exercise Tiger[0] w which was a rehearsal for the D-Day Normandy landings, where they created a replica of the beach landscape that would be encountered. Or there's Sindh Kalay[1] which is an Afghan village created in Norfolk, UK.

0. https://en.wikipedia.org/wiki/Exercise_Tiger

1. https://www.independent.co.uk/news/uk/this-britain/welcome-t...

I would imagine soldiers train for urban combat in actual houses or whatever landscape they need.