The road east of Terni (SS Valnerina) leads 10 km (6 miles) to the Cascata delle Marmore (Waterfalls of Marmore), which, at 541 feet, are the highest in Europe. A canal was dug by the Romans in the 3rd century BC to prevent flooding in the nearby agricultural plains. Nowadays the waters are often diverted to provide hydroelectric power for Terni, reducing the roaring falls to an unimpressive trickle, so check with the information office at the falls (there's a timetable on their website in English) or with Terni's tourist office before heading here. On summer evenings, when the falls are in full spate, the cascading water is floodlit to striking effect. The falls are usually at their most energetic at midday and at around 4 pm. This is a good place for hiking, except in December and January, when most trails may be closed.
SP79 10 km (6 miles) east of Terni, Terni, Umbria, 05100, Italy