About 17 km south of Patara, in the village of Bozoluk are the ruins of Letoon. With Xanthos, Letoon forms a UNESCO World-Heritage-Site. The sanctuary of Letoön was founded in honor of Leto the mother of Apollo and Artemis. The goddess Leto was of Anatolian origin and became the national godess of the Lycians. The Letoön was the official religious sanctuary, oracle and festival venue of the Lycian federation. It became Christianized during the Byzantine period and only was abandoned during the Arab raids of the 7th century. The archeological site consists of three temples to: Apollo, Artemis, and Leto. There is also a nymphaeum and a large well-preserved Hellenistic theatre.
More about Letoon and its history is available on the Lycian Turkey site.
Here are the photos of Letoon, click on the thumbnails to see greater pictures