A friend returned this week from 14 days in Umbria and then Florence. This family is a high-energy biking group, and the first thing they do when they go anywhere is to rent bikes. They go everywhere on their bikes regardless of terrain or traffic. 20 miles of hills is a warm-up for them.
They told me about biking to Civita di Bagnoregio. Biked over the bridge, of course. I had not heard of this interesting, deteriorating wreck of a place. An image which sticks in the brain, because all of mankind's works come to this except some things that are put into words or math or musical notes.