Glowworm Tunnel

Tucked into the dense bushland of the Blue Mountains, the Glowworm Tunnel is an abandoned railway tunnel that now serves as one of the region's most enchanting natural spectacles. Once part of the Zig Zag Railway, this dark, damp tunnel is home to thousands of glowworms that create a starry ceiling of bioluminescent blue-green light. It’s a short but atmospheric walk that feels like stepping into a subterranean fairy grotto – a must for anyone craving a unique, off-the-beaten-path experience in the mountains.

Highlights & What to See

• Glowworm Display: The main draw – walk deep into the tunnel, let your eyes adjust, and watch the ceiling twinkle with countless glowworms. Best seen on a cloudy day or after rain when the tunnel is darkest.
• Historic Railway Remnants: The tunnel is part of the former Zig Zag Railway line; look for old tracks, sleepers, and the engineering marvel of the nearby viaducts.
• Bushwalking: The 1.5 km (one-way) walk from the Glowworm Tunnel carpark follows a fire trail through eucalypt forest and fern gullies – keep an eye out for lyrebirds and wallabies.
• Photography: Bring a tripod and a torch with a red filter to capture the glowworms without disturbing them. The tunnel’s damp, echoing atmosphere also makes for moody long-exposure shots.

Suggested Time to Spend

Allow about 1.5 to 2 hours for the return walk and time inside the tunnel. The walk is easy and mostly flat, but the tunnel floor can be muddy and slippery – sturdy shoes and a headlamp are essential. Visit late afternoon to catch the glowworms at their brightest, then enjoy the twilight bushwalk back.

Nearby Areas Worth Combining

• Zig Zag Railway – Ride a historic steam train through the same mountain pass, with stunning valley views.
• Lithgow – A historic mining town with the Eskbank House Museum and the Blast Furnace Park.
• Jenolan Caves – World-class limestone caves with guided tours, about an hour’s drive south-west.
• Blackheath – A charming mountain village with excellent cafés, the Grand Canyon walk, and Govetts Leap lookout.
• Blue Mountains National Park – Endless bushwalking, lookouts, and waterfalls – combine the tunnel with a drive through the park’s scenic routes.

Please check official sources for current details.