This is the Theatre of Patara in the ancient city of
Patara. Patara was a flourishing maritime and commercial city on the south-west coast of Lycia on the Mediterranean coast of Turkey near the modern small town of Gelemis, in Antalya Province. It is the birth place of St. Nicholas, who lived most of his life in the nearby town of Myra (Demre).
Thanks SihirliFlut for the card (TR-63416).