Two views of the post office in Nagasaki, circa 1910, and a third card which dates from the 1930s or later, showing a larger building. A port city on the island of Kyushu, and a center for ship building in Japan, Nagasaki first hosted Portuguese traders in the 1500s. Over the years, it became an international port and a ship building center for the Japanese navy. Letters from sailors from around the world passed through its post office. A bad day to post a letter would have been August 9, 1945, when Nagasaki was the site of the world’s second atomic bomb attack.