Boston is a walking city and most historic sites are within a short walk to one another. The Freedom Trail, a red brick line along the sidewalk, connects most of the sites in the park. Points of interest, hotels and retail areas are accessible on foot or by the MBTA subway (T). Water transportation runs frequently between downtown Boston (Long Wharf) and the Charlestown Navy Yard. Limited visitor parking is located at the Charlestown Navy Yard. Several commercial parking garages are located in downtown Boston near the Freedom Trail sites and in the Charlestown Navy Yard.