The plaque was placed by the Tree of Peace and Unity, a weeping cherry tree planted last May on international soil to mark the 70th anniversary of the end of the war in Europe.
Speaking at the event, UN Deputy Secretary-General Jan Eliasson said “the creation of the United Nations in 1945 was a bold step in a new direction […] after so much tragic human sacrifice from the worst side of humanity.”
“Since then, the United Nations has saved countless lives around the world,” he added.
Eliasson described the 193-member Organization as being “the midwife at the birth of many treaties,” such as those ending racism and discrimination against women.