The Manwoldae complex was the main royal palace of the Koryo dynasty, set against the southern slopes of Mt Songak just north of the old city. Nothing now stands above ground: the site is a hillside of grass, stone foundation slabs, and stepped terraces. The footprint, however, is vast — the palace had over 100 buildings at its peak — and walking the slope gives a tangible sense of what the medieval capital looked like.
Archaeological surveys, including joint South Korean and North Korean digs in the 2000s, have recovered tens of thousands of artefacts here, many of them now in the Koryo Museum. The site is part of the UNESCO-listed Historic Monuments and Sites in Kaesong (2013).