Zardnaar
Legend
Fort Stony Batter Tunnels on Waiheke Island, Auckland New Zealand. They were WW2 army tunnels and gun emplacements build to defend against a possible Japanese invasion.
As a kid I used to run around in them with toy swords and fight my friends, pretending to be D&D characters. It was great having a real life dungeon to play in.
These days they are accessible by tour only.
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Kewl I was thinking Waitomo caves as well. NZ Underdark.