1. Asan (Hyonchung-sa): Situated at Onyang in Asan County, Chungchong Namdo, 118.1 km south of Seoul, Hyonchung-sa is the shrine built for Admiral Yi Sun Shin, Korea's most admired national hero who successfully defended the nation from an invading Japanese fleet in the late 1590s. The admiral invented turtle-shaped ironplated battleships with which he won a decisive sea battle against the invaders, Called Kobukson, literally meaning turtle ships, these battleships were the first such vessels ever used in a naval battle in the world. Chungmugong, the title given Admiral Yi by then King Sonjo, means a loyal warrior. The shrine, popularly regarded as a symbol of partriotism, draws a steady stream of domestic visitors and foreign tourists throughout the year.