The National Museum of the U.S. Navy presents a walking tour of the Washington Navy Yard!    This tour offiers a chance to explore the Washington Navy Yard and its 219-year history.  Attendees will visit the original Marine Watch Box, hear the true story behind Dahlgren's encased leg, see some of the historic items on display, and more!   For more information and to register, email Director of Education Thomas Frezza at thomas.frezza@navy.mil or call 202-433-4995.