A laser and light arts show is bringing a 21st Century touch to celebrations marking the bicentenary of the highest man-made feature in north east Wales.
Jubilee Tower on Moel Famau near Ruthin, Denbighshire is a ruin but back in 1810 work started on it to mark the golden jubilee of King George III.
It is 200 years since a foundation stone was laid.
Organisers hope to rival the ceremony, which was watched by thousands who walked to the summit at 1,818ft (554m).
A series of events has been organised for the eve of the 200th anniversary of the tower's foundation stone being laid on 25 October by Lord Kenyon.
There will also be a procession of hundreds of lanterns, made by children at art workshops, as well as live music, storytelling and other entertainment, and a firework display.
Centrepiece of Sunday's display will be a beam of light radiating from the tower, designed in part to replicate the original design.
The laser show has been running for the past week, with the light visible across the coast and Liverpool Bay.
'Spirit of innovation'
As well as lasers, there will be audio visual displays projected onto the walls of the tower.
Chris Oakley, from Coedpoeth, who has designed the show has been involved in similar projects at festivals and displays around the world.
"I spent much of my childhood in Broughton, so Moel Famau is something of a personal beacon to me, especially as my father used to fly model planes up there," said Mr Oakley.
"The view across the Vale of Clwyd provides a unique sense of time".
He said he wanted to carry on "spirit of innovation" by architect Thomas Harrison, whose tower was the first Egyptian revival building in Britain.
It was to be built in three stages, but the project was not without its problems with rising costs and disagreements.
The tower's tiers were only partially competed when it was reduced to its base by storm damage in 1862, leaving what stands today.
Other commemoration events in the past week have included a walk.
Park and rides have been set up for visitors (1400-1600 BST) at Mold and Ruthin county halls and Moel Famau bottom carpark, with the light projections starting from 1645 BST.