Badisco

The “Deers Cave” is the greatest and most important Neolithic picture gallery of the old-country. Over three thousand pictures, made in bat guano and red clay by the artists of six thousand years ago, are on the walls of its gangways, which are long over a mile.
It is extraordinary that in this cave all three pictorial styles (natural, sketch and abstract art) in the evolution of figurative art exist together. So, it was possible to decipher a lot of the worldwide, enigmatic grafen which precede the invention of writing