Belfast Castle is set on the slopes of Cavehill Country Park, Belfast and was built between 1811 and 1870 by the 3rd Marquess of Donegall. It was designed in the Scottish baronial style by Charles Lanyon and his son, of the architectural firm Lanyon, Lynn and Lanyon. In 1978, Belfast City Council began a major refurbishment over a period of ten years at a cost of over two million pounds. The architect was the Hewitt and Haslam Partnership. The building officially re-opened to the public on 11 November 1988.

Link: http://www.belfastcity.gov.uk/tourism-venues/belfastcastle/bcabout.aspx