Jongmyo Shrine is a Confucian sanctuary dedicated to the Joseon dynasty dead members. It was built in 1394 by king Taejo and is then thought to be the oldest Confucian sanctuary. It was destroyed by the Japanese and rebuilt in 1601. This one is still in place. It used to welcome some of the Tripitaka Koreana, wooden tablets that are now within the Haiensa temple, as well registered as WHS.
The main distinctive element is the great square in front of the building, 150 meters long and 100 meters width. The complex is still used today for ritual ceremonies.
This site is really intersting for its architecture and its symbolism. Located in the center of Seoul, you can easily get there by subway, the syop is Jongno 3 ga on the line 1.