Tourists visit the Great Theater in Ephesus of Turkey, on June 14, 2014. Artists from Turkey and Poland's Varsovia Sinfonia symphony orchestra performed during a concert to celebrate the 600th anniversary of two countries' diplomatic relations in the Great Theater of Ephesus in Turkey on Saturday. Ephesus, one of Turkey's world cultural heritages, was built more than 2,000 years ago. The Great Theater can accommodate up to 25,000 spectators. (Xinhua/Lu Zhe)