Wikipedia
Banwolseong
Banwolseong (半月城, literally “Half Moon Fortress”), also commonly known as Wolseong Palace, was the royal palace compound of the Korean Silla monarchy at their capital in Gyeongju during the Silla and Unified Silla periods (57 BCE-938 CE). It takes its name from the approximate outline of the palace walls which were shaped like a crescent moon. Banwolseong has been also known as Sinwolseong or Jaeseong, which means where the king resides.