Fairmount Park is the largest urban park in the United States, though, unlike Central Park, it’s actually on the west edge of town, separating Center City from the suburbs. Great for hikes, dog walks, off-road biking, and more. West River Drive runs along the edge of the park, as does the Philadelphia Zoo, the Dell East, and the Mann Music Center. There are tours of Colonial mansions within park grounds. That huge green dome visible from the expressway is Memorial Hall, the centerpiece of the 1876 Centennial Exhibition and the only building left from that event. It’s the future home of the Please Touch Museum. (For more on the Centennial, visit the Atwater Kent Museum or the Smithsonian in Washington, DC.)