The San Giovanni Cave is an extraordinary karst phenomenon, with its 850 meters is one of the longest natural tunnels in Europe.
Its name derives from the presence of an internalchapel dedicated to St.John's (San
Giovanni).
It is believed to have formed due to a collapse of the huge calcareous mass of "Monte Acqua" (Mount Water).
It is the only case in Italy, one of three in the world, of a natural cavity crossed by a
road.The long paved road that runs through the cave,leads to the mountainous area, is no longer viable for private vehicles in order to preserve the environmental conditions
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