The Kaunos Ruins near Dalyan, Turkey are one of the most popular tourist attractions in the area. Kaunos was an ancient city founded in the 9th century BC, and it was quite important by 400 BC. It was located on the border between Lycia and Caria, and the city's culture had characteristics of both empires. The city was once an important trading post on the sea, though today it is set back a few miles from the sea since the coastline has moved over the centuries. The receding coastline, attacks from various tribes, and a malaria epidemic led to the decline of Kaunos, and the city was abandoned by the 15th century.
The ruins include a well preserved theater, parts of the old city walls, and an acropolis. There's also a basilica, Roman baths, two Hellenistic temples and four Roman temples. From the acropolis, you can enjoy a gorgeous view of the ancient city. The theater could hold 5,000 people and is still occasionally used for events. Nearby you can also see Lycian tombs in the rocks above the Dalyan River.
The Kaunos Ruins are easy to reach from Dalyan. The closest airport is the Dalaman Airport, located 17 miles away. You can get to Dalyan by public transportation from either Marmaris or Fethiye, or you can join a tour that includes the ruins on its itinerary.