The area which is not only rich in nature but also history left numerous traces here. At the top of the Monte Casoli hill it is still possible to see cavernous dwellings (l'abitato rupestre di Monte Casoli a Bomarzo) which used to be inhabited since Neolithic time to the Middle Ages. Walking further along the CAI 125 you'd also find remains of the Etruscan and Roman altars cut from the rock and the ruins of an old abbey.