A winding trail in Italy’s Aurunci Mountains leads to a in a cave just under the Redentore peak, located at 1,160 meters (3,800 feet) above sea level. Inside the cave is Eremo di San Michele Arcangelo, beautiful hermitage that dates back to the ninth century. The Aurunci Mountains are dry and bare on the side that faces the Mediterranean. On a clear day, when they are not covered in mist, one can see the Pontine Islands and the Island of Ischia from their peaks. Over time, erosion caused by the water that…