Add Yahoo as a preferred source to see more of our stories on Google. The boardwalk along the Danube in Vidin, a city in a region of Bulgaria that is experiencing rapid depopulation. (Jodi Hilton / ...

In southern Bulgaria, in the village of Tyurkmen, many brick houses sit empty. Their tile roofs are falling in. Gergana Daskalova, an ecologist who spent summers here with her grandparents as a young ...