The four monuments that make up the Heart of Neolithic Orkney are unquestionably among the most important Neolithic sites in Western Europe. Criterion (ii): The Heart of Neolithic Orkney exhibits an important interchange of human values during the development of the architecture of major ceremonial complexes in the British Isles, Ireland and northwest Europe. Criterion (iii): Through the combination of ceremonial, funerary and domestic sites, the Heart of Neolithic Orkney bears a unique testimony to a cultural tradition that flourished between about 3000 BC and 2000 BC. Criterion (iv): The Heart of Neolithic Orkney is an outstanding example of an architectural ensemble and archaeological landscape that illustrate a significant stage of human history when the first large ceremonial monuments were built. AuthenticityThe level of authenticity in the Heart of Neolithic Orkney is high.