The National Aquarium in Baltimore is a public aquarium located at 501 E Pratt St. in the Inner Harbor area of Baltimore, Maryland, USA. It was opened in 1981 and was constructed during Baltimore's urban renewal period. The aquarium has an annual attendance of 1.6 million to see its collection of 16,500 specimens of 660 different species. Particular attractions include the dolphin display, rooftop rainforest, and central ray pool, and multiple-story shark tank.