Artist Andrew Cooper’s Nomansland, at the Senedd in Cardiff Bay, explores the Armistice and the events of Remembrance through a field of red.
Ceremonies to remember the servicemen and women who lost their lives in all past and present conflicts have taken place across Wales.
First Minister Rhodri Morgan was among those laying wreaths at the Welsh National War Memorial in Cathays Park, Cardiff, during a special service.
Among those marching to services were British Legion veterans in Newbridge, Caerphilly county.
Their parade had been threatened after a health and safety row.
Eighty years on from the first Poppy Day march through the streets of Newbridge, veterans had been told to shorten their route.
But they said they would rather cancel the march than alter it.
Eventually an agreement was reached between the legion members, Caerphilly council and the police and the march will go ahead as usual.
This year's services fall two days before the 90th anniversary of the armistice - the end of World War I in which almost 900,000 men and women from the British Armed Forces lost their lives.
Members of the armed forces, the merchant navy, fishing fleets and civilians will be among those marching along with ex-servicemen and women to the service in Cardiff.
The guns of the 104 Air Defence Regiment RA (V) from Baglan Barracks, Newport, were fired to mark the beginning and the end of a two minute silence.
In Swansea, lord mayor Gareth Sullivan took part in a 300-strong parade from the Oxford Street car park to St Mary's Church.
Mr Morgan paid tribute to armed service personnel who laid down their lives in service to their country.
"With every passing year, there are fewer surviving veterans that can remind us in person of the horrors of the World War I trenches," he said.
Former service personnel gather in Cathays Park for the commemoration
"But we must never forget the sacrifice they made and we will continue to honour them on this and every Remembrance Sunday.
"If anyone should doubt that Remembrance Sunday still retains its relevance to our modern society, they should be reminded that many of the service personnel on active duty in Afghanistan and Iraq today are under 30.
"More than 16,500 British Armed Forces Personnel have been killed or injured in active service since 1945 in Bosnia, the Falklands, Afghanistan and Iraq.
"They have lost their lives maintaining peace and upholding democracy and their sacrifice must never be forgotten."
Deputy First Minister Ieuan Wyn Jones added: "In the midst of our busy day to day lives I regard our act of remembrance as an important opportunity to stop and remember those who have lost their lives in conflict - the members of the armed forces, their families, those involved in peacekeeping initiatives and civilians.
"We must also remember the grief of countless families for whom this is a very poignant and emotional time. The memories of war and the impact it has on families and communities survive way beyond the battleground.