Here are some abandoned places that we discovered in Ukraine

Bunker 211

Map (50.320599, 30.388399)
An extensive bunker just off the main Highway from Kyiv to Odessa.

The bunker is buried under a mound on dirt. On top of the mound you can still see the outlines of the trenches from the war. If you walk around enough you can find multiple entrances to the bunker and can explore a little!