Sicily hosts the largest, most active volcano in Europe, Etna, aka, Mount Etna. The Silvestri Craters, one of which is pictured, were formed on Etna’s south slope during the eruption of 1892. Accessable from Rifugio Sapienza in Nicolosi, they are 6233 feet above sea level. You can walk along the rims of the two craters because they are extinct.
Bring a wind breaker with you (and wear it!) because on a gusty day, the wind can push you around!