MUSEUM DISTRICT & FAIRMOUNT PARK. In addition to more than 1500 animals ­ including orangutans, lorikeets, snow leopards, red pandas, giraffes, and giant bearded pigs ­ The very first zoo in the United States has some great animal-related attractions. Treehouse is perhaps the most famous; it's a fantastic interactive exhibit where you can experience what it's like to hatch from an egg, be a bee, or ride a caterpillar. The first children's zoo in the world is here, also, as are the first giant otters exhibited in the US. Fun for all!