Dry Tortugas is a group of small islands located in the Gulf of Mexico, about 70 miles west of Key West, Florida. The islands are known for their pristine beaches, crystal-clear waters, and abundant marine life, making them a popular destination for snorkeling, diving, and birdwatching. The main attraction of Dry Tortugas is Fort Jefferson, a massive 19th-century fortress that once served as a military prison during the Civil War. Today, visitors can explore the fort and learn about its history, as well as enjoy the natural beauty of the surrounding islands.