The kingdom spanned an area from the eastern edge of the Taurus mountains to the Euphrates River.
The ancient site _ which includes giant 10-meter (33-foot) -high, seated statues of Antiochus himself surrounded by ancient Gods, including Zeus and Apollo _ was discovered in 1881 by a German engineer.
Today, the site is listed as a UNESCO World Heritage Site and the monuments are among the best-known images of Turkey, featuring on postcards and Turkish tourism posters and ads.