10 Facts About the Tomb of the Unknown Soldier

(via Mental Floss) On Veterans Day, 1921, President Warren G. Harding presided over an interment ceremony at Arlington National Cemetery for an unknown soldier who died during World War I. Since then, three more soldiers have been added to the Tomb of the Unknowns (also known as the Tomb of the Unknown Soldier) memorial—and one has been disinterred. Here are 10 things you might not know about the historic site and the rituals that surround it.