King Sejong of the Golden Age
Not far from the Grand Palace, is the great golden statue of King Sejong sitting regally on his throne. He is the highly respected fourth King of the Joseon Dynasty.
I believe it was during his time when they call it the golden age in Korea. He was the driving force behind many inventions and in front of his statue, some of them are displayed such as the sundial, rain gauge and celestial globe. He invented these himself! The hangeul alphabet was also created during his reign.
There is also a gallery which contains more about the life and achievements of King Sejong including materials and artifacts. So, if you are interested in history, it would be worth a visit. And it is free!