(170221) -- WASHINGTON, Feb. 21, 2017 (Xinhua) -- People watch the military observance commemorating Presidents' Day at Mount Vernon, Virginia, the United States, Feb. 20, 2017. Large number of residents and tourists visited the plantation house of U.S. first President George Washington on Presidents' Day. (Xinhua/Yin Bogu) (zxj)more(170221) -- WASHINGTON, Feb. 21, 2017 (Xinhua) -- Honor guards attend the military observance commemorating Presidents' Day at Mount Vernon, Virginia, the United States, Feb. 20, 2017. Large number of residents and tourists visited the plantation house of U.S. first President George Washington on Presidents' Day. (Xinhua/Yin Bogu) (zxj)more(170221) -- WASHINGTON, Feb. 21, 2017 (Xinhua) -- People watch the military observance commemorating Presidents' Day at Mount Vernon, Virginia, the United States, Feb. 20, 2017. Large number of residents and tourists visited the plantation house of U.S. first President George Washington on Presidents' Day. (Xinhua/Yin Bogu) (zxj)more(170221) -- WASHINGTON, Feb. 21, 2017 (Xinhua) -- People watch the military observance commemorating Presidents' Day at Mount Vernon, Virginia, the United States, Feb. 20, 2017. Large number of residents and tourists visited the plantation house of U.S. first President George Washington on Presidents' Day. (Xinhua/Yin Bogu) (zxj)more