- Attu City is a former city located on the island of Attu in Alaska. It was established in 1943 as a military base during World War II and served as a strategic outpost for the United States. After the war, the military base was closed, and Attu City became a civilian community. However, due to the harsh and remote location, the population declined over the years, and in 2010, the city was abandoned. Today, Attu Island is uninhabited, and there are no permanent residents.