Detail of Kirbstones, Great Mound, Knowth, c. 3000 BC, Bru na Boinne, County Meath, Ireland. The megalithic Great Mound was probably built after Newgrange and before Dowth. Similar in size to Newgrange it is surrounded by 18 smaller satellite mounds and has two passages. A series of kirbstones line the underground passages and chambers with later inscriptions c.700 AD. A mixture of ogham scratchings and more modern alphabetic script, they are antique graffiti. Picture by Manuel Cohen
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