Free to enter once you have paid into Gyeongbokgung Palace and is remarkable to see from the outside with its stunning pagoda.
I didn't stay too long inside as by the time I reached it the whole oslaceccomplex was due to close within an hour but I found it very enlightening and enjoyable. If it had been raining I would have spent longer and it would have been a great alternative to the palace.
Well worth a visit though.