America's very first zoo is the Philadelphia Zoo, established in 1874. Today the zoo enjoys a reputation for breeding endangered species in captivity as well as simulated natural habitats for its animal population. Home to over 1300 animals, this urban zoo boasts one of the most state-of-the-art primate exhibits in the world, PECO Primate Reserve, a 2.50acre, indoor and outdoor areas that houses 10 different primate species—including gibbons, lowland gorillas, Sumatran Orangutans, lemurs, and Silverbacks. Cat lovers will purr at the sight of Big Cat Falls, which houses 12 endangered species of felines such as African Lions, Amur Tigers, jaguars, Snow Leopards, and cougars. If you don't get your fill during the day, stay for a rare overnight experience camps for kids.