Castor 🏔️ Overview Castor is a striking 4,223-meter (13,855-foot) mountain in the Pennine Alps, rising along the high Alpine frontier between Switzerland’s canton of Valais and Italy’s Aosta Valley. Together with nearby Pollux, it forms the famous pair of summits known as the “Twins,” named for Castor and Pollux of classical mythology. Of the two …
