Shedd Aquarium, a national historic landmark, has been home to more than 32,000 unique animals since 1930. It welcomes more than 2 million visitors to meet beluga whales and bluegills, rockhopper penguins and rockfish, alligators and an alligator snapping turtle, and so much more from the world's oceans, lakes, rivers, and reefs. Several permanent exhibits at Shedd include Waters of the World, Caribbean Reef, Amazon Rising, Wild Reef, Stingray Touch, Oceanarium, Fantasea, One World, and 4D Theater.