The landscaping of the natural site of Nemrut Dağ is one of the most colossal undertakings of the Hellenistic period (some of the stone blocks used weigh up to nine tons). Criterion (iii): The tomb or the Hierotheseion of Nemrut Dağ bears unique testimony to the civilization of the kingdom of Commagene. Criterion (iv): More so than the tombs at Karakus and Eski Kahta, the tumulus at Nemrut Dağ illustrates, through the liberal syncretism of a very original pantheon, a significant, historical period. Mount Nemrut Tumulus was registered as a First Degree Archaeological Site under Act No. 2873), an area that includes Nemrut Tumulus and other archaeological areas covering 13.850 ha were declared a Natural Park in 1988.