The Boston Naval Shipyard was originally known as the Charlestown Naval Shipyard and began operations in 1827.
The shipyard closed in 1974 and became part of Boston National Historic Park.
It is in the Charlestown neighborhood of Boston and is now the home of the USS Constitution, which was launched by the Navy in 1797, and USS Cassin.
During the winter, the USS Constitution is open to the public Thursday through Sunday. Unfortunately, my only chances to visit the location were on a Tuesday and Wednesday, so I could only take pictures from a distance.
Official site: National Park Service