Here are some abandoned places that we discovered in Ukraine

Teteriv Flooded Canyon

Map (50.201000, 28.386400)
It used to be a rock quarry that, as legend goes, the workers left one day and when they came back it was flooded! 

We were moderately impressed with this place. Lots of very nice places to set up a tent. We were there during the week but it appears by the number of obvious camping spots that on the weekend it might be busy A former granite quarry that has now been flooded. There are many walking paths and also a small damn that you can check out while spending your time relaxing.