1 / 4 The International Day of Peace has been celebrated around the world on September 21 each year since 1981. The day, which was established by a unanimous United Nations resolution, invites all humanity to contribute to a culture and society of peace. /VCG Photo
2 / 4 People in Greece marked the day by using candles to form a dove icon in front of Panathenaic Stadium in Athens on Friday. /VCG Photo
3 / 4 Israeli women held signs saying 'Women Wage Peace' at a march by peace groups on Thursday. They want to achieve a political solution to the Israeli Palestinian conflict. /VCG Photo
4 / 4 UN Secretary General Antonio Guterres attended a ceremony marking the 37th anniversary of International Peace Day. He took photos with Hollywood star Michael Douglas (R) and others in front of Japanese Peace Bell at UN headquarters in New York on Friday. /VCG Photo