St. Louis Zoo - World class zoo with more than 6,600 animals. Exhibits include River's Edge, The Wild, Discover Corner, Historic Hill, and Red Rocks. See elephants, cheetahs, hyenas, penguins, bears, great apes, primates, birds, reptiles, lions, tigers, pet friendly bunnies, goats, and butterfly's wandering in flight. • Gateway Arch - Jefferson National Expansion Memorial - Stands 630 feet and is our nation's tallest man-made monument. Take a tram ride to the top and visit the Lewis and Clark exhibits at the Museum of Westward Expansion.