Geumjeongsan Fortress

Geumjeongsan Fortress is Korea's biggest stone fortress, with walls stretching over 18 kilometers—more than 5 km longer than the second-largest fortress. Built on Geumjeong Mountain's ridge during the Joseon Dynasty, it offers a 17-kilometer hiking circuit with panoramic views of Busan and the Nakdong River delta. The North Gate, towering 7 meters high as Korea's largest surviving fortress gate, anchors this rugged trail that sees 200,000 hikers yearly—50% more than the average fortress hike in Busan.