At Yazılıkaya, just outside the capital of Hattusa, a series of reliefs of Hittite gods in procession decorate open-air "chambers" made by adding barriers among the natural rock formations.
The Assyrians probably took the form from the Hittites; the sites chosen for their 49 recorded reliefs often also make little sense if "signalling" to the general population was the intent, being high and remote, but often near water.