MetaFilter has a neat post about four towns in Massachusetts—Dana, Enfield, Greenwich and Prescott—swallowed up by the Quabbin Reservoir in 1938.
It's a longstanding piece of Massachusetts lore: When the Quabbin Reservoir is low, they say a church steeple rises from the water, a ghostly reminder of the towns submerged by the flooding of the Swift River Valley in 1939.
No offense, says Dale Monette, program coordinator at the Quabbin Visitors Center in Belchertown, but, "I guarantee he's never seen it." No structures of the four "lost" towns of the valley, all vacated and disincorporated in March 1938, were left standing, he confirmed on the day I visited. [Link]One town up here in Maine—Flagstaff—met a similar fate. Here's a list of other drowned towns in the U.S.