The New England Civil War Museum was established in March 1994. It is located within the Memorial Building, inside a former Grand Army of the Republic (GAR) Hall in Rockville, Connecticut. Thomas F. Burpee Post #71 of the Grand Army of the Republic held their monthly meetings in the Grand Hall from 1890 until 1929. Camp #45 of the Sons of Union Veterans of the Civil War, their direct heir have held their monthly meeting here from 1890 until the present, making it the oldest, continuously used GAR Hall in the entire country.