Charlestown Navy Yard. Charlestown today is a mainly residential neighborhood with an institutional presence. Major institutions include Bunker Hill Community College, Spaulding Rehabilitation Center, and a facility of Massachusetts General Hospital. The Navy Yard, home to , is now part of the Boston National Historical Park, which marks the southern edge of the neighborhood. The waterfront has two marinas, Constitution Marina and Shipyard Quarters Marina. Geography Charlestown is located north of downtown Boston on a peninsula extending southeastward between the Charles River and the Mystic River. City Square in the southern part of Charlestown was the location of the city hall before annexation by Boston. It is also the terminus of the Charlestown Bridge and the former Warren Bridge, and was formerly a stop on the Charlestown Elevated. The Central Artery was built between 1951 and 1954, routing elevated ramps through City Square. The Central Artery North Area (CANA) project moved these underground, into the City Square Tunnel, making way for a revitalized surface park. The Thompson Square is located at the confluence of Main Street, Dexter Row, Green Street, and Austin Street. Thompson Square station was formerly a stop on the Charlestown Elevated. A small portion of Charlestown is north of the Mystic River, containing the northern approach to the Malden Bridge and now the entrance to Encore Boston Harbor (which made jurisdiction over the casino a matter of dispute). This land was formerly a peninsula, but landfill has more completely connected it to the mainland of Everett. This boundary was part of the original 1649 separation of Malden from Charlestown, where the Penny Ferry operated at the time; the first bridge opened on the site in 1787. Two small hills mostly covered in residential buildings fill the interior of the neighborhood: Bunker Hill, which is more northerly, and Breed's Hill, which is the site of the Bunker Hill Monument. Bunker Hill was named after George Bunker, who had owned it during early settlement in the 1600s. Arts and culture Charlestown has many places of historical interest, some of which are included along the northern end of Boston's Freedom Trail. The Freedom Trail ends at the Bunker Hill Monument commemorating the famous Battle of Bunker Hill, an early major battle in the American Revolutionary War. Launched in 1797, the USS Constitution is the oldest commissioned vessel in the US Navy and the oldest warship in the world still afloat.