Located on Philadelphia's stunning waterfront, the Independence Seaport Museum explores the maritime history of the Delaware River and is a great place to take the kids. Inside, visitors find interactive exhibits explaining how boats float, the cargo unloading process for container ships and undersea technology. Plus, just outside the museum in the Penn's Landing Marina are two ships to explore: the Olympia, Admiral Dewey's flagship in the Spanish-American War, and World War II Submarine Becuna.