It used to be blue
Introduction
The photograph on this page of It used to be blue by Neil Owen 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: © Neil Owen Taken: 10 Jun 2014
Now it's a rather unexpected Aztec/Inca theme? Still can't work out what it is for.