Today commemorates the landing of ANZAC forces on the shores of Gallipoli in Turkey in 1915 while honouring fallen and serving Australian soldiers from all wars and conflicts.
More than 8,000 Australians died during the eight-month campaign that ensued after Gallipoli.
At dawn on the shores of Gallipoli, it was a time to reflect, honour and pray for those who lost their lives.
Australian air-force chaplain Noel Williams said the wounded and dying turned to the Lord's Prayer at Gallipoli so reciting it 102 years later was a way to transcend history.
New Zealand's Chief of Navy, Rear Admiral John Martin, then recounted The Ode.
The traditional recitation on Anzac Day comes from an English poem written in the early days of World War One.
"They went with songs to battle, they were young,
Straight of limb, true of eye, steady and aglow.
They were staunch to the end against odds uncounted,
They fell with their faces to the foe.
"They shall not grow old, as we that are left grow old.
Age shall not weary them, nor the years condemn.
At the going down of the sun and in the morning,
We will remember them."
Foreign Minister Julie Bishop paid tribute to those who fought at Gallipoli.
"Here, at this most treasured and honoured site, we thank the people of Turkey for welcoming us back each year and acknowledging our shared history and friendship. This is where we can pay our respects, in silent contemplation of the enormity of the debt we owe to those who fought here. Gallipoli makes us proud to be Australian. Lest we forget."
Ms Bishop was one of a number of dignitaries to lay wreaths.
They came from the Turkish side as well.
Then, the national anthems of Australia, Turkey and, finally, New Zealand.
A minute's silence and, in military tradition, the Last Post, signalled the end of the day.
The number of Australians who travelled to Turkey was lower than in previous years, largely because of heightened concern over possible terrorist attacks.
Safety concerns also affected attendance at the services in Australia.
At Villers-Bretonneux in France, an Anzac Day dawn service was held 100 years on from the most costly year in Australia's military history.
Australia suffered some 60,000 casualties on the Western Front in 1917.
Veteran-affairs minister Dan Tehan spoke at that ceremony, saying those who died in that fateful year did not do so in vain.
"In 1917, those who served did not do so for themselves but for us, for a world where a bitter end may mean something greater, something better. That our something better was born out of the sacrifice on the Western Front a hundred years ago is something our nation cannot forget."
And on yet another front, Prime Minister Malcolm Turnbull marked Anzac Day by travelling to Iraq to meet with Australian forces there.
"Like your forebears a hundred years ago, the Anzacs of the First World War, you are here in the Middle East as the Anzacs were ... and, of course, around the world, Australian servicemen and women defending our values, defending our liberty, keeping us safe. And we are fighting with the same allies we fought with a hundred years ago, but in a different fight, this time the fight against terrorism. You're on the front line here, and I want to thank you."
