Is that Russia, like London, perhaps other places like Germany heavily bombed in the war. Then they simply layered on top. Russia was quite bad at rebuilding it. Easier to salvage. Where they kept the top of the building because it was useable. Imagine Syria. How do you build it back. Hmm they often want to keep most of the buildings sometimes they have foundations and a floor plan. Most of the walls. So they just raise the ground level with the other debris. You get the idea.

London was bad at rebuilding too. It wanted to keep the same blueprints. As a result the streets didn't get much wider.