A Shropshire mill which gave birth to the skyscraper has been named one of the most at risk buildings in England.
Ditherington Flax Mill and its attached former malt kiln, in Shrewsbury, needs £5m of public money to be repaired, the group said.
Built in 1797, it was the world's first building erected around an iron frame.
The technique was later adapted in the rebuilding of Chicago in the late 19th Century and later skyscrapers such as New York's Empire State Building.
English Heritage said the mill was one of 34 at risk buildings in Shropshire.
Grade I castle
Other buildings have been taken off the at risk list after undergoing repairs. These include the grade I-listed Whittington Castle, which was initially feared to be structurally unstable.
The 12th Century remains of the Grade II-listed Old Church of St Chads, in Belmont, have also been restored.
The 18th Century grade I-listed Castle House Flats, in Castle Square, Ludlow - which incorporates part of a 12th Century castle - has also been brought back into use.
Also taken off the list is the grade II-listed workshop buildings and Clay Arcs at Jackfield Tile Museum, in Jackfield, Broseley.