The National Aquarium in Baltimore opened in August of 1981 and has over 17,000 marine mammals, fish, birds, reptiles, and amphibians. The National Aquarium has several different exhibits such as the Atlantic Coral Reef, Dolphin Discovery, Jellies Invasion, Shark Alley, and much more. It also features a 4D Immersion Theater. There are lots of things to see and learn at the National Aquarium. See the animals in their naturalistic habitats and be prepared to see breathtaking exhibits.