Fort Gaines is a historic military fort located on Dauphin Island, Alabama. Built in the early 19th century, it was designed to protect the entrance to Mobile Bay. The fort played a significant role during the American Civil War, particularly during the Battle of Mobile Bay in 1864, when it was attacked by Union forces. Today, Fort Gaines is preserved as a historic site and is open to the public. Visitors can explore its well-maintained structures, including the original cannons and barracks. The fort offers educational programs and guided tours, providing insight into its history and the broader context of the American Civil War.