St. Louis Zoo

The third-largest zoo in the country, with 90 acres of space and 700 species of animals on exhibit, this place is a must-see on a family vacation to St. Louis. The zoo is open year-round with free general admission. Some areas, however, do require a small fee, including the sea lion shows, the new insectarium and the children's zoo, where kids can pet the animals. Other areas include the big cat country, the jungle of the apes, the primate house, the river's edge (an elephant exhibit) and feeding areas for bears and sea lions.