Hike through the Gorge dell’Infernaccio up to the Hermitage of San Leonardo

Eventually, just as it gets thin enough to just walk through you appear out the other side.
This river has carved over millions of years, a way through, once thought to be the only easy way in ancient times through the Appennines.
http://www.baldhiker.com/2015/05/03/hike-through-the-gorge-dellinfernaccio-up-to-the-hermitage-of-san-leonardo/