Guide
The Amagi-yama Tunnel (Former Amagi Tunnel) is a historic stone-built road tunnel located at the foot of the Amagi Pass on the Izu Peninsula in Shizuoka Prefecture. Completed in 1905 (Meiji 38), it is renowned as the longest existing stone-built road tunnel in Japan. Due to its immense architectural 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 has now been preserved as a scenic landmark where visitors can feel the weight of history and profound silence.
This tunnel is a precious relic showcasing the advanced civil engineering techniques of the Meiji era. It was constructed to overcome the rugged terrain of Mount Amagi, which once separated the north and south of the Izu Peninsula. Built with a total cost of 103,016 yen (at the time), the structure utilizes precision-cut stones for its arches and walls. The stone used is the durable Yoshida stone from the former Dani Town, ensuring the structure has endured for over a century. In 1916, the tunnel even supported bus operations, contributing significantly to regional development. Since the opening of the new Amagi Tunnel in 1970, its role as a road has ended, but it remains a protected site of cultural value, even being selected as one of the '100 Best Roads in Japan.'
The greatest draw is the heavy, majestic stone structure inside. The precision of the stone-cut arches demonstrates the high level of craftsmanship from that era. To enhance the atmosphere, the lighting uses sodium lamps designed to mimic the warm, nostalgic glow of vintage gas lamps, casting a beautiful light upon the stone walls. This creates a mystical 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 drainage side), offering a sensation of traveling back in time as you walk through it.
The Amagi-yama Tunnel is open 24 hours a day, allowing for visits at any time. We highly recommend visiting during the twilight or evening hours. As the gas-lamp-style lights turn on, the stone walls are beautifully illuminated, creating a truly enchanting and photogenic landscape. Please note that the temperature inside the tunnel is influenced by the external environment; it tends to be cool in the summer and quite chilly in the winter, so please prepare accordingly.
Visitors can enjoy a quiet stroll while observing the exquisite historical architecture. Because parts of the tunnel floor have had their paving removed to preserve its original state, the environment feels very authentic and close to nature. For photography enthusiasts, the contrast between the warm light and the textured stone walls provides a stunning subject. The area is also popular among hikers, offering a luxurious way to experience historical ruins alongside natural beauty.
The Amagi-yama Tunnel is located on a key route for Izu sightseeing. The surrounding area is rich with hiking trails and sites related to the history of the Amagi Pass. Additionally, the hot spring (onsen) areas of Izu City and Kawazu Town are relatively close, making it easy to plan a trip that combines historical exploration with a relaxing soak in an onsen. We recommend checking the locations of nearby parking lots and public restrooms before your visit.
Because the lighting inside the tunnel is limited and the stone structure can result in uneven or slippery surfaces, we strongly recommend wearing comfortable walking shoes. While the tunnel is cool in summer, it can become very cold in winter, so please bring warm clothing. There is no entrance fee (it is free to access), but please check information regarding nearby parking. When taking photos, please be mindful of other visitors and maintain proper etiquette to preserve this historical site.