An ancient canon is seen on the wall of the Old Town of Dubrovnik in south Croatia, April 11, 2019. Located in the south of Croatia, Dubrovnik is one of the most famous tourists' destinations by the Adriatic Sea. The old city of Dubrovnik was enlisted as the UNESCO World Heritage in 1979. In recent years, Dubrovnik became widely known as the main filming location in Croatia for King's Landing, the capital of the Seven Kingdoms in the TV show Game of Thrones. (Xinhua/Zheng Huansong)