hohllay man made cave luxembourg

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Hohllay man-made cave in Luxembourg Royalty Free Stock Photo
Hohllay man-made cave in Luxembourg Royalty Free Stock Photo
Hohllay man-made cave in Luxembourg Royalty Free Stock Photo
   
   
   
   
Hohllay man-made cave in Luxembourg
   
   
   
   
   
   
   
Hohllay, man-made cave was formed during mining for sandstone millstones during the Roman times and the Middle Ages, Luxembourg


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