The ancestral home of Lord Byron has been named as one of the world's most threatened cultural heritage sites.
The New York-based World Monuments Watch said Newstead Abbey in Nottinghamshire was desperately in need of long-term maintenance.
Newstead Abbey is on a list of 67 of the world's most treasured sites which the organisation wants to be saved.
Other UK sites include Birmingham Central Library, Preston Bus Station and London's Southbank Centre.
Nottingham City Council recently reduced the building's opening hours because of budget cuts.
Dr Jonathan Foyle, from the World Monument Fund, said: "What we're concerned about is that we'd like to help generate a culture of care and involve the community.
"There are about three million people within an hour's drive of Newstead, it's so important, it's so reachable and it's also so beautiful.
"We'd like to help the council to come up with a plan to open it up and make it more financially sustainable."