In the middle of Gyeongju City, just outside the downtown area, is the Banwolseong Castle site, up on a hill, in a crescent shape; it is one of Silla's palatial ruins.
With the South River (Namcheon) to its front and overlooking Namsan Castle in the distance, Banwolseong Castle was, geographically, a very important fortress.
Down from Banwolseong, you can find Gyerim(Chicken Forest), where the founder of the Kim clan, Kim Al-ji, was said to have been born.
According to the story, King Talhae heard the sound of a chicken in the forest, at that spot, a gold box was found hanging from the branch of a tree, with a white chicken under it. A baby, Kim Al-ji, was found in the box.
Near Gyerim, there is the Cheomseongdae Observatory, one of the oldest astronomical observatories of its kind East Asia.
The observatory consists of 362 stones which correspond to the days in a year and representing the number of basic stars.