these spaces are being lovingly restored. money and hard work have been spent to make them attractive. some haven't had that treatment but have become popular nonetheless. this is rummu. it was one of a string of soviet—run prisons that used to stretch across estonia. it's has quite a grim backstory. that's all history now, right? from their arrival in 1940, the soviets used prisoners here to mine and process limestone from the quarry. when estonia regained its independence in 1991, the site was abandoned and reclaimed by rising groundwater. today, it's become popular with swimmers, divers and snorkellers. so, what can you tell me