Guida
The Amagi-yama Tunnel (Old Amagi Tunnel) is a historic stone-built road tunnel located at the foot of the Amagi Pass in the Izu Peninsula, Shizuoka Prefecture. Completed in 1905 (Meiji 38), it is celebrated as the longest existing stone-built road tunnel in Japan. Due to its immense architectural and historical value, it was designated as a National Important Cultural Property in 2001—the first road tunnel to receive such an honor. Once a vital transport route connecting Izu City and Kawazu Town, it now serves as a preserved tourist attraction where visitors can feel the profound weight of history and enjoy a sense of absolute tranquility.
This tunnel is a precious relic that showcases the advanced civil engineering techniques of the Meiji era. It was constructed to overcome the rugged terrain of the Amagi Mountains, which once separated the north and south of the Izu Peninsula. The construction utilized high-quality 'kirishi' (cut stone) for the arches and walls, including stone from the former Yoshida area of Ozu Town, ensuring a robust structure that has endured for over a century. In 1916, the tunnel even supported bus operations, contributing significantly to regional development. After the new Amagi Tunnel opened in 1970, its role as a main road ended, but it remains a cherished site, even being selected as one of 'Japan's 100 Best Roads' for its cultural significance.
The greatest allure lies in the heavy, majestic stone structure within the tunnel. The precision of the cut-stone arches demonstrates the incredible craftsmanship of the era. To enhance the atmosphere, the interior is lit by sodium lamps designed to mimic the appearance of vintage gas lamps, casting a warm, nostalgic glow upon the stone walls. This lighting creates a mystical, dreamlike ambiance that differs greatly from the daytime. The tunnel is approximately 445.5 meters long and 3.5 meters wide (about 4.1 meters including the side gutters), offering a walking experience that feels like stepping back in time.
The tunnel is open 24 hours a day, allowing for flexible visits. We highly recommend visiting during the evening or night. As the gas-lamp-style lights turn on, the stone walls become beautifully illuminated, creating a truly enchanting and photogenic landscape. While the scenery around the entrance changes with the seasons, please note that the interior temperature is influenced by the outside environment; it tends to be cool in the summer and quite chilly in the winter. Be sure to dress accordingly.
Visitors can enjoy a peaceful stroll while observing the breathtaking historical architecture. Because parts of the original pavement have been removed to preserve its historical character, the path feels more natural and authentic. For photography enthusiasts, the contrast between the warm light and the textured stone walls provides stunning subjects. It is also a popular spot for those looking for a quiet walk alongside nature and history.
The Amagi-yama Tunnel is a key landmark on the Izu sightseeing route. The surrounding area features hiking trails and sites related to the history of crossing the Amagi Pass. Additionally, the famous hot spring (onsen) areas of Izu City and Kawazu Town are relatively close, allowing you to combine a historical exploration with a relaxing soak in a hot spring.
Since the interior lighting is somewhat dim and the stone structure can result in uneven or slippery surfaces, we strongly recommend wearing comfortable walking shoes. Because the tunnel stays cool in summer and cold in winter, bring a light jacket or seasonal clothing. There is no admission fee, but please check local parking availability. When taking photos, please be mindful of other visitors and respect the quiet atmosphere of this historical site.