The monument with the ancient inscription is known as Arslan Kaya (also spelled Aslan Kaya), which means "lion rock" in Turkish.Image credit: daphnusia via Alamy Stock Photo

Ah, yes, I see that little doorway at its bottom there!

Hellenistic Depiction of Matar Kubileya
The Phrygians worshipped the goddess Cybele. In their language it was known as Matar 'Mother', and was also referred to as Matar Kubileya 'Mother of the mountain' (from which the Greek Kybele and Latin Cybele derive) or Matar areyastin.[23] In her typical Phrygian form, she wears a long belted dress, a polos (a high cylindrical headdress), and a veil covering the whole body. The later version of Cybele was established by a pupil of Phidias, the sculptor Agoracritus, and became the image most widely adopted by Cybele's expanding following, both in the Aegean world and at Rome. It shows her humanized though still enthroned, her hand resting on an attendant lion and the other holding the tympanon, a circular frame drum, similar to a tambourine.