A multi-million pound project to restore the Great East Window in York Minster has been unveiled.
York Minster's Great East Window is 600 years old
York Minster Revealed focuses on conserving the largest expanse of medieval stained glass in the world.
About £19m will be spent on restoring the window along with improving access to the building and recruiting the next generation of glaziers and masons.
Minster officials have previously warned the window is buckling and is in "real danger".
They expect the scheme will take 15 years to complete.
The Great East Window was created between 1405 and 1408 by the master glazier John Thornton of Coventry.
The window will be taken down and prepared for safe storage until the fragile stonework of its surrounding walls is repaired.
It will then be conserved by experts from the York Glaziers Trust, who have received a lottery grant.
As part of the process, the trust will recruit two new apprentices which it hopes will help to keep vital skills alive.