Xanthos was the capital of Lycia, a federation in what is now Turkey's southwestern coast.
Together with Letoon, which was a religious centre lying 4 km to the south, Xanthos is a UNESCO World Heritage site since 1988.
Xanthos is 500 mt away from the highway, 17 km to Kalkan. Letoon is 4 km away from highway, 23 km away from Kalkan in total (19 km on highway+4 km on the secondary way). It's possible to go all the way to the carpark located at the entrance of the site by car.