About 60,000 Canadian forces were killed during World War I, and more than 11,000 of their graves remain undiscovered. The Canadian National Vimy Memorial in Vimy, France, was built in memory of these unknown heroes. One of the few National Historic Sites of Canada outside the nation, the site features a concrete memorial that is situated atop a ridge and towers over the surrounding landscape. The memorial structure consists of twenty human figures and has the names of all those soldiers with unaccounted graves etched onto the walls. Around the memorial, one can visit preserved tunnels and trenches symbolic of the war, along with the visitors center that provides guided tours of the memorial complex.