The Aberdeen Pavilion (Pavillon Aberdeen in French) is an exhibition hall in Ottawa, Ontario, Canada. Overlooking the Rideau Canal, it is located in Lansdowne Park, Ottawa's historic fairgrounds. For many years, the building was known as the "Cattle Castle", due to its use for the Central Canada Exhibition's agricultural exhibits and shows. It is the last surviving Canadian example of what was once a common form of Victorian exhibition hall, and was designated a National Historic Site of Canada in 1983. It is one of the oldest surviving indoor ice hockey venues in the world, although it is no longer used for ice hockey. It is the oldest surviving venue in which the Stanley Cup was contested, having hosted Stanley Cup challenge matches in 1904 between the Ottawa Hockey Club and challengers. History The pavilion was built in 1898 to serve as the central hall for the Central Canada Exhibition. Designed by Moses C. Edey, it was inspired by London's Crystal Palace. It was named after Governor General Lord Aberdeen who presided over its opening. The structure was built by the Dominion Bridge Company, and took only two months and ($ in dollars) to complete. The structure consists of a series of large steel arches holding up the roof. This allows for a large and column-free interior space of some . For many years, the main purpose of the structure was for agricultural shows, and from this came its "Cattle Castle" nickname. In wartime, the building became an important military structure. It was the home of Strathcona's Horse before they departed for the Boer War. In the First World War, it was the mustering point for Princess Patricia's Canadian Light Infantry, and it served as a general recruiting centre and the home to the Cameron Highlanders of Ottawa and the 4th Princess Louise Dragoon Guards during the Second World War. Restoration In 1982, the building was designated a heritage structure under the Ontario Heritage Act, but it was showing its age and required significant restoration work that would have cost several million dollars. Given serious structural problems, the pavilion had been closed to the public for a number of years Many of the structure's windows were broken, the exterior paint was peeling, and the words "Cattle Castle" had been ignominiously painted on the front of the once elegant structure. City Council agreed to help finance the pavilion's restoration, but the