What's behind the green door?
Introduction
The photograph on this page of What's behind the green door? by Oliver Dixon 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: © Oliver Dixon Taken: 7 Apr 2010
Mystery structure above Bridge End, Allendale. The adjacent antenna suggests that whatever is in inside is being controlled remotely - or alternatively that whatever is being monitored is being relayed elsewhere.