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#10 – Grotto of the Marvels (Spain)
Amazing stalactites and stalagmites are awaiting for you here!
via upload.wikimedia.orgcomplain
This grotto was discovered in 1886, but the first tourists were allowed to see its wonders only in 1914. This grotto is quite big - 2130 meters long. It has amazing stalactites, stalagmites and lakes.
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