United Nations Secretary-General Ban Ki-moon rings the peace bell during a ceremony to mark the International Day of Peace which falls on Sept. 21, at UN headquarters in New York, Sept. 16, 2016. (Xinhua/Li Muzi)
United Nations Secretary-General Ban Ki-moon rings the peace bell during a ceremony to mark the International Day of Peace which falls on Sept. 21, at UN headquarters in New York, Sept. 16, 2016. (Xinhua/Li Muzi)