Megane-bashi (Spectacles Bridge) — Japan's Oldest Stone Arch

**Reflection photography:** The spectacles reflection is visible only during specific water levels and lighting conditions — the optimal window is 10:00–14:00 on sunny days with normal river flow. After heavy rain the river is too turbulent; during drought the arches sit too high above water. **Heart stone hunt:** The heart stone is on the eastern retaining wall, 3 meters south of the bridge. During summer (June-August) vegetation sometimes obscures it. A smartphone flashlight helps identify the shape in shadow. **Riverside walk:** The Nakashima River has a 2km paved path passing under 10 historic stone bridges — Megane-bashi is #3 from the south. The full walk (40 minutes) passes through residential Nagasaki with no tourist infrastructure, offering a glimpse of daily city life.