Philadelphia is Pennsylvania's largest metropolis, located just an hour south of New York City via Amtrak train. The vibrant, diverse city is known for its renowned historic attractions connected to the American Revolutionary War, including preserved Independence Hall, the site of the signing of the American Constitution and Declaration of Independence. Other iconic attractions include the Liberty Bell and the Philadelphia Museum of Art, which was immortalized in the feature film Rocky. Visitors can tour the Eastern State Penitentiary, peruse the stalls and food halls of the Reading Terminal Market, or take families to the Philadelphia Zoo, which is home to more than 1,300 native and exotic animals. During the summer months, Spruce Street Harbor Park transforms the city's river shoreline into an urban beach filled with giant games, hammocks, and food vendors. In the winter, the BlueCross River Rink offers waterfront ice skating opportunities.