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Jurassic cave located just north of Erba. The entrance is enormous frequently compared to Milan’s Cathedral at about 45 meters in height, 38 wide and over 400 in length. Use of the cave dates back to Paleolithic times as evidenced by flints and cooking utensils left behind by nomadic hunters. Brickworks at the entrance date from the 16th century with numerous legends of prior use in 1160 as a shelter by the inhabitants of Erba and in 1316 where Guelfo Parravicini drew up his last will and testament.