United Nations Secretary General Ban Ki-moon (L) stands with his wife Soon-taek and U.N. Messengers of Peace and Goodwill Ambassadors Michael Douglas (C), Jane Goodall (2nd from R) and Herbie Hancock (R) during the annual peace bell ceremony to commemorate the International Day of Peace at U.N. headquarters in New York, September 21, 2015. REUTERS/Mike Segar