It is known that Xanthos, whose history goes back to 3000 BC, was the biggest administrative center and capital of Lycia in Antiquity. Letoon, which was included in the UNESCO World Cultural Heritage List in 1988 with Xanthos, is one of the most important religious centers of this period. Xanthos and Letoon are important elements of the world heritage in terms of the archaeological values they contain. We started the relief work of the Arch of Victory, located at the entrance of the Xanthos Archaeological Excavation Site, by measuring it with a 3D laser scanning device.