The airy ridge that connects Rifugio Rinaldi (2018m, on Mount Terminilletto) with the summit of Terminillo (2217m), passing through the Passo del Cavallo. It's just over 800 meters as the crow flies, and should only be traversed with great care and if you are sure-footed and don't suffer from vertigo. The view is magnificent, overlooking Valle dell'Inferno and Valle degli Angeli (on the left as you walk from Rinaldi towards Terminillo).

Thanks to Patrizia for the photo.