TELEVISION presenter and historian Jonathan Foyle laid the first brick in a 10ft-tall Lego model of Durham Cathedral.
Another 200,000 bricks will be needed to complete the model, which is being built on a plinth outside the cathedral’s coffee shop, off the cloisters.
Visitors will be able to sponsor bricks for £1 each. Money raised will used for the cathedral’s Open Treasure project.
The project aims to open to the public parts of the building and artefacts which were previously rarely seen.
Dr Foyle’s last visit to Durham Cathedral was to climb it for a television programme.
“I have always had a soft spot for the building,” he said. “It stands in the first rank of Britain’s buildings.
“Creating a 10ft Lego model is a formidable prospect, so it reminds us of the amazing achievements of the builders almost 1,000 years ago.”
Visitors can view the Lego build in progress and sponsor bricks from 9.30am to 4pm, Monday to Saturday, and from noon to 4pm on Sunday.
Donations can be made online at www.durhamcathedral.co.uk.