Koguryo was an ancient Korean empire whose brilliant history flourished on a vast expanse of land in East Asia.
The royal mausoleum of King Jangsu (r. A.D. 413-491) is the prime example. It stands like a pyramid that measures 31 meters each side and stands 13 meters high, a reason that it is dubbed the 'Pyramid of the East.' There are over 10,000 stone tombs of this style and others (stone chambers covered with dirt on top) still extant; one of them measures 71 meters each side. Tomb guards used to take care of the mausoleums of kings and aristocrats and ceremonial services have taken place on a regular basis.