According to Wikipedia, Choate Bridge located in Ipswich, Massachusetts (about 30 miles North of Boston) is a stone arch bridge built in 1764 carrying Route 1A/Route 133 over the Ipswich River. It is considered one of the oldest surviving bridges in North America and is more than likely the oldest in Massachusetts.
Local folklore and urban legends have persisted for generations, claiming that two old shipwrecks may have clues to a long-lost viking grave on Carney Island in Maine.