Seoul recently developed evening visits to its most famous palaces, and this is surely the best way to dicover or rediscover them.
Even if the city is one of the biggest of Asia, and full of modern buidlings and enlighten districts, the old korean palaces are still surrounded by mountains and protected large walls.
Visiting Gyeongbokgung at night would be surely a very peaceful moment to you, and most of koreans will use this opportunity to spend some time in couple.
The Gyeonghoeru pavillon was a place used for holding banquets and ceremonies inside the palace. Visitors are not allowed to access the building, but it still seems to be one of the symbols of Seoul.