1. Memorial Museum Passchendaele 1917Zonnebeke The Memorial Museum Passchendaele 1917 in Zonnebeke is a Belgian museum devoted to the 1917 Battle of Passchendaele , where in 1917 in only 100 days, almost 500,000 men were killed for only eight kilometers gain of ground. The museum is housed in the historic château grounds of Zonnebeke and focuses on the material aspects of World War I. From Wikipedia, the free encyclopedia.