Peter Thomson, president of the 71st session of United Nations General Assembly, UN Secretary-General Ban Ki-moon, his wife Yoo Soon-taek (L to R, 1st row), UN Messengers of Peace Leonardo DiCaprio(2nd left, 2nd row), Jane Goodall(2nd right, 2nd row), Michael Douglas(1st right, 2nd row) pose for a photo 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)
