Ottawa's Parliament Hill stands high above the Ottawa River and is graced by the Neo-Gothic style Parliament buildings built in the last half of the 19th century. The most prominent feature is the Peace Tower that divides the House of Commons and the Senate on either side. In front of the Parliament buildings is the Centennial Flame, lit in 1966 to commemorate the centenary of the Canadian Confederation, and behind the buildings is a sculpture garden. In the summer, theChanging of the Guard takes place on the front lawn of the Houses of Parliament, weather permitting. Below Parliament Hill, a lovely walk runs alongside the Ottawa River.