Hidden Gems Blue Mountains: Secret Tunnels, Aboriginal Art & Abandoned Railways

March 8, 2026

Hidden Gems Blue Mountains: Beyond the Three Sisters

While millions flock to Echo Point and the Three Sisters, the Blue Mountains hide some of New South Wales' most extraordinary secret locations. From 1,600-year-old Aboriginal rock art to abandoned railway tunnels filled with glow worms, and WWII chemical weapon storage sites to Australia's birthplace of steel, these hidden gems reveal the true depth of the Blue Mountains' history and natural beauty.

Aboriginal Heritage & Ancient Rock Art

Red Hands Cave, Glenbrook

Aboriginal Hand Painting Red Hands Cave Blue Mountains

One of the most significant Aboriginal rock art sites in NSW, Red Hands Cave features vibrant hand stencils created by the Darug people over 1,600 years ago. The cave was likely used as a ceremonial site for the initiation of young warriors. You can access it via an 8km loop walk from Glenbrook Causeway or take the shorter 1km route from the top car park.

Highlights: Aboriginal axe-grinding grooves, protected hand stencils, Blue Pool and Jellybean Pool nearby

Glow Worm Tunnels & Underground Wonders

Newnes Glow Worm Tunnel, Wollemi National Park

Deep in Wollemi National Park, this abandoned 1907 railway tunnel has been transformed into one of nature's most spectacular light shows. The 400-metre curved passage is home to thousands of bioluminescent larvae that create a "starry night" effect in pitch darkness. Access via the Newnes Plateau (easy 1km walk) or the challenging 9km hike through Penrose Gorge from Wolgan Valley.

Highlights: Bioluminescent glow worms, pagoda rock formations, Newnes Industrial Ruins nearby

Helensburgh Glow Worm Tunnel

Located on the southern edge of the Blue Mountains near Helensburgh, this 600-metre tunnel offers an easier glow worm experience with a flat, family-friendly walk. The tunnel was part of the Metropolitan Colliery railway and now hosts thousands of glow worms along its brick-lined walls.

Highlights: Easy access, family-friendly, less crowded than Newnes

Abandoned Railways & Industrial Heritage

Glenbrook Tunnel (Lapstone Hill Tunnel)

This S-shaped tunnel has one of the darkest histories in the Blue Mountains. Built in 1892 to replace the Lapstone Zig Zag, it was abandoned by 1913 due to its dangerous 1:33 gradient. During WWII, the RAAF used it to store mustard gas and chemical weapons. Later, it became a massive mushroom farm for nearly 100 years. The tunnel is currently being restored for public access (expected 2026), but you can explore the impressive portals and cuttings.

Highlights: WWII history, mushroom farm infrastructure, Knapsack Bridge nearby

Newnes Shale Oil Refinery, Wolgan Valley

Between 1906 and 1932, Newnes was a bustling town of 1,600 people built around one of the world's most ambitious oil shale operations. Today, massive brick kilns, beehive coke ovens, and crumbling refinery walls remain as a monument to failed industrial ambition. The ruins are accessible via a 2.5km loop walk, though you'll need to cross the Wolgan River (4WD or rock-hop on foot).

Highlights: Beehive coke ovens, the "Big Wall," Newnes Hotel, wombat sightings

Lithgow Blast Furnace

Built in 1906, this site was once the only producer of iron in Australia, fueling the construction of the Trans-Australian Railway. The towering brick walls and rusted engine houses remain as one of the most visually powerful heritage sites in Australia. It's also world-famous among astrophotographers for "through-the-roof" Milky Way shots.

Highlights: Davy and Ferranti engine houses, iron "skulls," Lake Pillans wetlands, astrophotography

Planning Your Blue Mountains Hidden Gems Adventure

Best Base Towns:

Glenbrook: Perfect for Red Hands Cave, Glenbrook Tunnel, and Jellybean Pool
Lithgow: Gateway to Newnes, Lithgow Blast Furnace, and Wollemi National Park
Katoomba: Central location for day trips to all sites

Essential Tips: