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arethuza
on Sept 11, 2017
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Unearthed near Hadrian’s Wall: lost secrets of fir...
We still have no idea how or why people would melt the rock walls of fortresses to create "vitrified" forts:
https://en.wikipedia.org/wiki/Vitrified_fort
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Search:
https://en.wikipedia.org/wiki/Vitrified_fort