Parco dei Gessi Bolognesi e Calanchi dell'Abbadessa

The chalky Mt. Castello, situated in a strategic position in Acquafredda blind valley, was known since the Lower Paleolithic Age and housed prehistorical settlements during the whole Copper Age. The rests of some female burial objects found along the steep southern slope date back to the latter period. The area of the Former Wire Quarry, the one and only quarry using helical wire, is of particular paleontological interest, since the quarry activity has divided a swallow hole bringing to light paleontological finds dating back to the Würmian period, including a cervid skull and several bones of prehistoric bison (Bison priscus) now on display at Donini Museum in S.Lazzaro di Savena.