Derry has been declared as a United Nations (UN) International City of Peace.
The title was awarded in recognition of the city's, and surrounding area, move towards peace since the Troubles ended.
There are currently almost 400 UN International Cities of Peace across the world.
The programme promotes global peace and supports health and well-being.
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Award founder J Frederick Arment said that "when you become an international city of peace it is a freeze-frame of where you are in time".
He added that Derry "has emerged and now is unified to heal the cultural trauma, but the youth do not have that trauma instilled and they are the future".
An award ceremony included local children talking about peace and video messages from similar peace cities.
A message from the daughter of Archbishop Desmond Tutu, Rev Canon Mpho Tutu van Furth, was also played.
She said it is "so joyful" that the city "has been named a city of peace and we know that it will be a beacon of hope both now and in the future".
The inclusion of the city in the initiative was led by former First Derry Presbyterian Minister, Rev David Latimer.
"If people are enjoying security, prosperity and quality of life then they will not think about lifting up guns and bombs," he said.
