Fortified Barn, Banks Farm
Introduction
The photograph on this page of Fortified Barn, Banks Farm by Simon Carey as part of the Geograph project.
The Geograph project started in 2005 with the aim of publishing, organising and preserving representative images for every square kilometre of Great Britain, Ireland and the Isle of Man.
There are currently over 7.5m images from over 14,400 individuals and you can help contribute to the project by visiting https://www.geograph.org.uk

Image: © Simon Carey Taken: 6 Dec 2009
I believe this is a 19th century folly rather than an ancient building converted into a barn.