Hattusha is the capital of Hittite's first Anatolian organised state to play an important role in the archaeological past of Anatolia. After the destruction of Hattus, the city of Hattusha was founded around 1600 BC. Hattusha is located within the Bogazkoy - Alacahoyuk National Park. The Hittites were one of the two largest civilisations of its age and excavations made at their capital city show that the first settlements in this area began with the Palaeolithic Age, while the settlement was most fully advanced during the Old Bronze Age (3000-2500 BC). The oldest Hittite written in 1800 BC is at Bogazkoy. The town's wall and doors, the palace, the archives and temples are still there today. A temple called Yazilikaya is located 2 km away from the city. The first known open-air temple in Anatolia, Yazilikaya's flat rock faces, are carved with Hittite Gods’ and Goddess’ stone reliefs.