Hum, there is some sort of keyhole, in a rock, on a hill, facing a ruined castle...
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Replying to @belathoud
You found the Bat Cave!

Mar 1, 2021 · 4:30 AM UTC

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Replying to @bilcorry
I was hoping for something more advanced from the Batman... This is a pretty mundane key. ;)
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This is European Batman. He couldn’t get the permit to use a wireless keyless system.