The first burial mounds in Korea were dolmens, which contained material from cultures of the 1st millennium AD, such as bronze-ware, pottery, and other symbols of society elite. The most famous tumuli in Korea, dating around 300 AD, are those left behind by the Korean Baekje, Goguryeo(Kogyuro/Koguryo), Silla, and Gaya states and are clustered around ancient capital cities in modern-day Pyongyang, Ji'an, Jilin, Seoul, and Gyeongju. The Goguryeo tombs, shaped like pyramids, are famous for the well-preserved wall murals like the ones at Anak Tomb No.3, which depict the culture and artistry of the people. The base of the tomb of King Gwanggaeto is 85 meters on each side, half of the size of the Great Pyramids. Goguryeo Silla tombs are most noted for the fabulous offerings that have been excavated such as delicate golden crowns and glassware and beads that probably made their way to Korea via the Silk Road. Many indigenous Korean artifacts and culture were transmitted to the tomb builders of early Japan, such as horsetrappings, bronze mirrors, paintings and iron-ware.