Not quite Europe but skulls were found in Jericho that had their interiors filled with clay and segments of shells in the eye sockets .Similar finds dated to 6750 BC of 1m tall statues were recorded at Ain Ghazal in Jordan . At Cayonu in Southern Turkey a house had 600 skulls under the floor , as the finds were of young people it was considered that they were sacrifices rather than trophies or ancestor worship . Nearer to home and a bit later there are the Iron Age deposits of young male skulls all without sign of injury and deposited after losing their flesh in the River Walbrook .