Abandoned towns are always fun to visit, and they're even more enticing if they've been off-limits for decades. Such is the case with Japan's Hashima Island, more commonly known as Battleship Island. This speck of an island about 15 kilometers from Nagasaki was once home to the densest population in the world, housing thousands of workers between 1887 and 1974 who harvested coal from the sea floor for the massive Mitsubishi company. ]]>