The largest and most impressive sacred site of Hattusha is the Yazilikaya Open Air Temple hidden outside the city, hidden among high rocks. In the temple, more than 90 gods, goddesses, animals and imaginary creatures were carved into the rock surface.

God and the goddess series were the god of storm and the goddess of the sun, the chief god of the imperial pantheon. As a result; Yazılıkaya can be defined as ş New Year's Festival House Yaz. According to the texts of the Hittite cult, all the gods gathered at the New Year and Spring Ceremonies gathered in the inde House of the Storm God Hit. In this festival, the statues of gods from all the other temples of the city may have been moved to Yazılıkaya in a ceremonial process.

There is a special arrangement and arrangement of relief figures on rock in Yazılıkaya A Room. Here, on the left rock surface, only gods except two, on the right side are the goddesses alone. On the main stage, the encounter between the god of storms and his wife, the sun goddess and their common children are depicted. On the wall opposite the main stage the larger king size IV. Tuthaliya is processed. The king is depicted on two hills, in the ritual dress of the God of the Sun, holding the wand with the tip as the symbol of sovereignty. It is understood that this sacred area was built by this king.

The reliefs in Room B are not in the form of belts in the main room; four independent figures were processed on the side walls. In the beginning of Chamber A, the twelve gods with the sword portrayed in the gods passage and the erg God of Sword ak Nergal, must be in the sense of the underground gods who are in contact with the other world. Great King IV. The guardian god of Tuthaliya, Sharruma, is portrayed in a situation that leads to the king and guides him. Great King IV. Tuthaliya's name is given in hieroglyphic writing.