Shipwrecks are interesting because of what they can tell us about history, who came before us, why they were here, and the difficulty they experienced in navigating these waters. They also serve as a home to many organisms. Often called artificial reefs, shipwrecks attract a plethora of animal life. The City of Washington, shown here, sunk in July of 1917 while being used as a coal-transporting barge. (photo: Paige Gill - Florida Keys NMS)