The town-house is also a noteworthy building and contains large and important archives.
There are remains of a Moorish fort on the hill commanding the town; and the north gateway - the Puerta del Colegio - is a fine lofty arch, surmounted by an emblematic statue and the city arms. The most prominent buildings are the episcopal palace (1733), with a frontage of a 600 ft.; the town house (1843), containing important archives; and the cathedral, a small Gothic structure built on the site of a former mosque in the 14th century, and enlarged and tastelessly restored in 1829.
With the exception of the church and the town-house, the buildings are mostly of wood.
The lighter punish ments inflicted by masters were commonly personal chastisement or banishment from the town house to rural labour; the severer were employment in the mill (pistrinum) or relegation to the mines or quarries.
There are several small parks and squares, including Central Square, Beacon Square, about which the business portion of the township is centred, and Saltonstall Park, in which is a monument to the memory of Watertown's soldiers who died in the Civil War, and near which are the Town House and the Free Public Library, containing a valuable collection of 60,000 books and pamphlets and historical memorials.