The Duke and Duchess of Cambridge were greeted in Liege by the King and Queen of Belgium
World leaders are gathering in Belgium for one of a number of ceremonies marking 100 years since Britain joined World War One.
The Duke and Duchess of Cambridge will be at the Liege event, as the Prince of Wales and PM attend a Glasgow service.
UK buildings from Downing Street to the Blackpool Tower will turn lights off from 22:00 BST to mark the centenary.
The public can join the switch-off ending at 23:00 - the time Britain declared war on Germany in 1914.
Prime Minister David Cameron told BBC Breakfast the outbreak of war was "an extraordinary day in Britain's history".
"When you think that almost every family, almost every community was affected, almost a million British people were lost in this war, it is right that even 100 years on, we commemorate it, we think about it and we mark it properly," he said.
The Queen will not attend any of the major ceremonies, but will pay her respects at a service in Crathie Kirk near Balmoral in Scotland. The Duke of Edinburgh will attend a ceremony at Sandringham Church in Norfolk.
About 17 million soldiers and civilians were killed between 1914 and 1918.
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