The crescent-shaped earthwork fortress that served as the main palace enclosure of the Silla kings from the 2nd century AD onward. The walls follow the natural topography of a low ridge, enclosing an area of about 32,000 square metres. The palace buildings within have long since disappeared, leaving a grassy parkland with scattered archaeological excavations and stone foundations.
The site is interesting rather than spectacular — this is archaeology in progress, not a restored monument — but it gives a sense of the physical scale of the Silla royal precinct. The adjacent Gyerim grove (a stand of old trees believed to be the birthplace of the Kim clan, founders of Silla) is particularly pleasant to walk through.