The Sandiaoling Bike Tunnel is a journey through history, nature, and innovative design. You don’t need to be a cycling enthusiast or history buff to enjoy this immersive experience—it’s a perfect escape for anyone seeking a unique adventure close to Taipei.
The Sandiaoling Tunnel was originally built in 1922 as part of the Yilan Railway Line, during the Japanese colonial era. At the time of its construction, the tunnel was the first in Taiwan to utilize electric rock drilling technology. The tunnel served for over 60 years before being abandoned in 1985 when the railway was re-routed. For decades after, the tunnel was a hidden gem, known only to rail enthusiasts.
In 2022, one hundred years after it was originally built, the Tunnel found a new purpose. As cycling became a popular leisure activity in Taiwan and interest in preserving historical landmarks grew, the local government transformed the deserted tunnel into a bike path.
The tunnel spans roughly 2 kilometers and connects Houtong and Mudan. Riders begin their journey on country roads alongside the modern railway, where trains frequently pass by. Once inside, the tunnel shows its meticulously redesign known as “The Dark Line.” The space is dimly lit and constructed primarily with reinforced steel, the tunnel retains its industrial charm while incorporating eco-friendly elements. A highlight awaits at the western end, where the architects intentionally left water within the tunnel, creating reflection pools ideal for photography.
Another unique feature of the tunnel is its thriving population of bats, which have made it their home. Cyclists are instructed to slow down and avoid using flash photography to minimize disturbance to these nocturnal residents.