Numerous, excavated in the sandstone, communicating they cross the subsoil of the historical center with labyrinthine course. For a long time it was believed that they were the remains of ancient sandstone quarries or even places to store wine. But the explorations, the interpretations made and the tourist routes, which have made these caves available today, have unveiled the presence in almost all the environments of architectural embellishments, bas-reliefs and decorative details.
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