The NYTimes has an disturbing story about Hasankeyf, which I visited back in June of 2014. See Dam Project Threatens to Submerge Thousands of Years of Turkish History. Sound like the town itself could be submerged. The fate of the ancient ruins above the town is uncertain. Glad I got there when I did.
The town of Hasankeyf, on the banks for the Tigris River, from the ruins of the ancient city (click on photo for enlargement)