This will by local guides be claimed to be the world's oldest lighthouse.

Patara was the headport of Lycia and then famous for its temple and oracle of Apollo. Many claimed that it was more accurate than the oracle at Delphi. In 300 CE St. Nicholas was born here, the bishop from which the legend of Santa Claus stems. Over time, the harbour silted up, taking away Patara's main asset.
The ruins of Patara are largely unexcavated, really only permitting the larger structure to penetrate 2000 years of rubble and vegetation. The foremost sights are the 1st century CE Roman gateway, not triumphal arch, which is slightly unusual having three arches and the threatre that leans on a knoll rising visible above the ancient ruins. The temple of Apollo has never been located, but at the little hill to the west of the gateway a head of Apollo has been found, making this place a hot candidate.
On your way from the gateway to the theatre, you pass through the bath complex, which has several of its arches preserved. Somewhat to the west lies a fine 2nd century CE temple, noted for its seven metre high entrance.
The theatre has preserved its stage in a fair state with five doors and five windows above them.
The ruins are open 7.30-19.00 in summer, and 8.30-17.00 in winter.