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In addition to the Olympia and Submarine Becuna you can also see a number of the ships of the mothball fleet by taking a cruise on one of the tour boats. The USS New Jersey is being renovated for  her new career as a museum at a slip just south of the E-Center in Camden, and can easily be seen from the river. Also, the cruise ship SS United States is berthed in South Philadelphia awaiting her possible renovation. Often in the summer active US Navy vessels will stop at Penn's Landing. One of the last surviving liberty ships is _base_d in Baltimore.  I can't remember her full name, it's a person's name, the last name being Brown.  I believe they periodically cruise her in the Chesapeake with paying customers. I hope this helps. Buzz