Glowworm Tunnel

This underground passage was built in the 1880s, officially called the Metropolitan Tunnel. However, it had a short-lived life and was closed in 1915 after years of soot and smoke built up inside the space, which made it dangerous for the crews and passengers of the trains to pass. The end of the tunnel was sealed to make it a reservoir. So eventually a colony of glowworms—one of the largest in all of New South Wales—moved in and made its home on the roof. The insects illuminate the stale, inky air like a constellation of blue-green stars.