Other features of interest include the museum and school of art and science, the former county jail (on the site of a Saxon and Norman castle), the Shire Hall (now headquarters of the County Council) and the Whitefield memorial church. A park in the south of the city contains a spa, a chalybeate spring having been discovered in 1814. West of this, across the canal, are the remains (a gateway and some walls) of Llanthony Secunda Priory, a cell of the mother abbey in the Vale of Ewyas, Monmouthshire, which in the reign of King Edward IV became the secondary establishment.