The first time you step onto the platform above Göynük Canyon the world rearranges itself — the pine-sprinkled limestone slopes drop away into a narrow throat of shadow and river, and the air smells sharp with cedar and salt blown inland from the Mediterranean. Guides click harnesses and helmets into place with efficient calm; below, the canyon seems to dare you to fly. At 40 meters above the ground and pushing toward 65 km/h on the fastest stretches, the ZipFly course turns that dare into a brief, intense conversation between you and the gorge.