Yazilikaya
This shrine, formed by two natural ravines, is the largest known Hittite rock sanctuary. The purpose of the shrine remains a mystery, although we can speculate that it was used for annual cult celebrations or even as a royal funerary site. There was probably a processional road leading down from the royal residence at Hattusas, and the presence of a nearby spring may have played a part in the selection of the site as a sacred spot.

In the large rock-enclosed court of Chamber A are some of the most incredible treasures of the Hittite architectural legacy. Hewn from one end of the rock enclosure to the other is a representation of a sacred procession of deities, all of which are of Hurrian origin. Hurrian gods were given prominence by the Hittite Queen Putuhepa, wife of Hattusilis III, who was herself of noble Hurrian or Eastern origin. The cylindrical domed headdress is a symbol of divinity of Mesopotamian influence. The deities are oriented to the main scene on the back wall where the Storm God Tesup and the Sun Goddess Hepatu meet. The Storm God Tesup and Sun Goddess Hepatu, also of Hurrian origin, became the two most important deities in the Hittite pantheon, the accepted counterparts of the Hittite Storm God and the Sun Goddess of Arinna. Towering above the main scene and standing over 3.5m (12 ft.) high is a large relief of King Tudhaliya IV, son of Hattusilis III and Puduhepa. The existence of three depictions of Tudhaliya (there are two others in Chamber B) at the exclusion of all other Hittite kings leads scholars to believe that the sanctuary dates to his reign (1250-1220 B.C.), although the sanctuary's construction was probably begun by his father.

To the right passing through a narrow rock crevice is Chamber B, probably a memorial chapel to King Tudhaliya IV, son of Hattusilis III and Putuhepa. The reliefs in this chamber were buried until the end of the 19th century, so they are better preserved than the ones in Chamber A. The largest relief is of King Tudhaliya IV, on the main wall next to a puzzling depiction of a large sword formed by two extended lions with a divine human head for a handle. This possibly represents the God of Swords, or Nergal of the underworld. The relief on the right wall depicts a row of 12 gods bearing sickles similar to the ones in the other chamber. The number 12 as a sacred number is first seen here and repeated many times in subsequent civilizations -- there were 12 gods of Olympus, 12 apostles, 12 imams of Islamic mysticism, 12 months in a year, 12 days of Christmas, and 12 to a dozen. The three niches carved into the far end of the chamber are believed to have contained the cremated remains of Hittite royalty.