If you didn’t know where to look you could easily miss this spot, but it’s truly fascinating for a number of reasons. It’s tucked away up a small track near the Helensburgh train station, having been built originally in the mid 1800s but retired from use in 1920. Through the 60s and 70s apparently people used it to grow and farm mushrooms, but now it’s an incredible spot for exploring, photography, and if the conditions are right spotting glowworms! Make sure you are wearing sturdy shoes, preferably ones that you don’t mind getting wet (ie – gumboots!), and take a torch (a head-torch is best). See how far you can make it into the tunnel before you get spooked out... apparently it’s haunted?!