The Newnes Glow Worm Railway Tunnel.

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Sometimes, abandoned man-made structures turn into dangerous eyesores, rotting away slowly before returning to nature or being torn down.
But other times, like when abandoned ships are re-purposed as living reefs, or mines colonized by bats, abandoned structures take on a new semi-natural life all their own, like a crab who uses a jar for a shell.
Such is the case with the Newnes railroad tunnel.
The Newnes railroad was closed in 1932 after 25 years of shipping oil shale.
The rails were pulled out of the 600-meter tunnel, which had been bored through the sandstone in the Wollemi National Park, and the tunnel was left to its own devices.
For Newnes, that meant becoming home to thousands and thousands of glow worms.
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The glow worm is a catch-all name for the bioluminescent larvae of various species, in this case the Arachnocampa richardsae, a type of fungus gnat.
Found in massive numbers in caves, the fungus gnat larvae cling to the rocky walls of the abandoned tunnel and hunt with long, glowing strings of sticky mucus.
To see the glowing gnats, enter the tunnel during daylight hours, and head to the middle – it gets dark in the middle where there is a bend in the tunnel – with a flashlight, so as not to bump into the walls.
Turn off the light and wait a minute or two. One by one, the gnats will begin to shine like stars emerging in the night.
via Newnes Glow Worm Tunnel | Atlas Obscura.

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