Paldalmun, which is designated as Treasure No. 402, is the south gate of the Hwaseong Fortress. The name means “open roads in every direction.” The stone rainbow-style gate was wide enough for a king's visits accompanied by horses and sedan chairs, and above the gate a second-story structure was built. A low fence was erected around the upper story of the castle gate, a semi-circular castle called Ongseong was built outside the gate, and jeokdae, a gate guard platform, was constructed to repel enemies.