6. The Columbus Zoo and Aquarium
Location: Powell, Ohio, United States of America
Number of Animal Species: 793
Number of Animals: over 10,000
Notable Species: Bobcats, wolverines, Mexican wolves, American beavers, polar bears, arctic foxes, reindeer, Asian elephants, pythons, flamingos, manatees, penguins, mandrills, kiwis and koalas.
Opening: 1927
Features: 18-hole golf course, animal conservation program, train, tram and boat rides.
Size: 580 acres