The late Neolithic Age site of The Balnuaran of Clava, popularly known as Clava Cairns, dating from 2500 BCE.
Uploaded by Joshua J. Mark, published on 21 October 2012 under the following license: Creative Commons: Attribution. This license lets others distribute, remix, tweak, and build upon your work, even commercially, as long as they credit you for the original creation. This is the most accommodating of licenses offered, in terms of what others can do with your works licensed under Attribution.