Discover the undersea world of the Florida Keys during a visit to the Key West Aquarium. Learn about sea turtles and the efforts the aquarium is making for species conservation. Visit the aquarium's fascinating exhibits, including the Atlantic Shores Exhibit, a 50,000-gallon tank, showcasing a mangrove environment. No trip to Key West is complete without a visit to the world's first open-air aquarium that is also the city’s first tourist attraction.