Gyeongbokgung Palace
The main palace of the Joseon kings; free entry if you wear hanbok
A fuller guide to this place, built from 6 sources, is written in Traditional Chinese.
Being there
Watch the changing of the guard at Gwanghwamun at ten, then go in to see Gyeonghoeru pavilion on its pond.
The story
Gyeongbokgung was the largest palace of the Joseon dynasty. It was almost entirely destroyed in war, and most of what you see has been rebuilt piece by piece. Bugaksan mountain rises behind it; in front runs one of Seoul's great avenues.