Fort Drum - Credit: Wikimedia Commons
Fort Drum - Credit: Wikimedia Commons
Fort Drum, also known as El Fraile Island (), is a heavily fortified island situated at the mouth of Manila Bay in the Philippines, due south of Corregidor Island. Nicknamed a "concrete battleship", the reinforced concrete sea fort, shaped like a battleship, was built by the United States in 1909 as one of the harbor defenses at the wider South Channel entrance to the Bay during the American colonial period. Read more on Wikipedia
Source: en.wikipedia.org