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The Santa Barbara cave, at the San Giovanni rolling mill, is the one which arouses the most scientific interest. Apart from the beauty of its concretions, it contains a quite unique characteristic: the crystals of barite which cover its roof and walls. The presence of these crystals make it one of the most ancient caves in the world.
Iglesias’s long and impassioned historical past stands out in the beauty of the works of art and certainly to be considered thus are the severe and elegant churches which represent the town’s principle treasures.