The town's name derives from the personal name of a Roman nobleman, Arrone, that in the IX century, had a castle built here in Valnerina. Municipality in the province of Terni, it is located near the Black River, not far from the Waterfalls of the Marmore and Lake Piedilucco, bordering with the territory of its provincial capital. The old town center still retains its medieval structure with fortified walls and narrow alleys. It is an ideal place for visitors looking for art, history and nature, for lovers of trekking, mountain biking routes and canoeing. Lovers of typical regional cuisine will appreciate the authenticity of local dishes and production of local delicatessen. The town's economy relies mainly on agricultural activities, such as the cultivation of olive trees.
The area was an important settlement already during the Roman Ages, as evidenced by the presence of water mills and the ruins of pagan temples. The town was built around a castle erected in the IX century and which developed and expanded in later periods. In the XIII century the city of Spoleto acquired the possession of the territories, that were repurchased by the residents of Arrone a few years later. Between the XVII and XVIII centuries, the local inhabitants stirred against the feudal system of Spoleto. At the end of the XVIII century, with the arrival of the troops of Napoleon, the town submitted looting and destruction. After the fall of the Empire of Napoleon, the Papal States regained the domain and the County of Arrone was enlarged and incorporated several territories in the nearby.
- the Church of San Giovanni Battista, dating from the XIII century, in Gothic style features a polygonal apse. Inside it is enriched with exquisite frescoes;
- the Collegiate Church of Santa Maria Assunta with its XVcentury portal, features a three nave and three apse plan. It is decorated with frescoes by several artists, including Tamagni and Giovanni of Spoleto, a painting inspired by the style of Perugino and interesting pieces of pottery of the XVI century;
- the Church and the former Convent of San Francesco;
- the Parish Church of San Valentino;
- the Church of San Nicola, which features a series of important frescoes;
- the Hermitage of Our Lady of the Rock built on a rocky outcrop overlooking the valley;
- Monte Moro, which is an archaeological site with remains of a settlement of pre-Roman origins;
- the Black River Park;
- the XI century Castle;
- the medieval Castle in the village of Casteldilago;
- the Roman Mill.