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Photo: Dosseman, CC BY-SA 4.0 via Wikimedia Commons
This was a religious site for Xanthos and populated over the same timescale. There's an amphitheatre, a Roman Christian basilica, and ruins of three temples - that of Leto has been partly reconstructed.
Letoon or Letoum in the Fethiye district of Muğla Province, Turkey, was a sanctuary of Leto located 4 kilometres (2.5 mi) south of the ancient city of Xanthos, to which it was closely associated, and along the Xanthos River. It was one of the most important religious centres in the region though never a fully-occupied settlement.
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Ksantos
Xanthos was the chief city of the Lycian federation, populated from the 8th century BC into the Byzantine era. Features include Lycian tombs, an amphitheatre, and an obelisk with a funerary text in Ancient Greek, Lycian and Milyan / Lycian B. Several treasures were carried off to the British Museum in London so the Nereid Monument, the tomb of Payava, and the original sculptures of the Harpy Tomb here are replicas.