The National WWI Museum and Memorial has unveiled the contents of the time capsule that had been placed in the cornerstone of the Memorial Courtyard – and the items did not disappoint. The National WWI Museum and Memorial has announced it’ll be opening a time capsule that was placed in the cornerstone on the Memorial Courtyard during construction in the 1920s. A story published in the Kansas City Times during that period states that it contains objects and historical objects dating back to the First World War, including signed copies of the 1918 Armistice agreement and the country’s official declaration of war from 1917.