Daereungwon Ancient Tomb Complex. There were 23 large tombs were built in the early Silla period around 400-500CE for Kings, Queens, and nobles, similar to the Valley of the Kings and Queens in Egypt. Can only go inside one which we did. The Korean royalty was also buried with large amounts of fabulous stuff for use in the afterlife, much of which was robbed. The surviving relics are in the National Museum close by which we also toured (our guide has been a docent there for 10 years).