Brock's Monument is a 56-metre (185 ft) column atop Queenston Heights in Queenston, Ontario, Canada, dedicated to Major General Sir Isaac Brock, one of Canada's heroes of the War of 1812. Brock and one of his Canadian aides-de-camp, Lieutenant-Colonel John Macdonell, are interred at the monument's base on the heights above the battlefield where both fell during the Battle of Queenston Heights. The current monument was constructed between 1853 and 1856, which replaced an earlier Monument to Brock on the battlefield (1824–1840). Parks Canada maintains the monument, the most imposing feature of Queenston Heights National Historic Site. It is the 3rd oldest war memorial in Canada.