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1. Underground Poland
An increasing number of routes running through cellars, mines, dungeons or caves are made available for sightseeing. Modern underground museums are also created. https://www.flickr.com/photos/polandmf...
An increasing number of routes running through cellars, mines, dungeons or caves are made available for sightseeing. Modern underground museums are also created. https://www.flickr.com/photos/polandmf...