Monte Forato, Mountain summit in Alpi Apuane, Tuscany, Italy

Monte Forato is a mountain in the Apuan Alps, in the province of Lucca, Tuscany. It has two peaks of similar height: the higher reaches 1,230 metres, while the northern one stands at 1,204 metres and carries a cross. Between them, erosion by water and wind in the limestone has opened a natural arch with a span of 32 metres, about 25 metres high above the pass below and roughly 8 metres thick.

The arch formed through erosion by water and wind on the limestone of Monte Forato, creating a span 32 metres wide and 25 metres high above the Passo dell'arco. The rock forming the arch is about 8 metres thick and 12 metres high, making it one of Italy's largest natural arches. A legend attributes the hole to a slap from Saint Pellegrino that sent the devil flying into the Versilia sea.

People in nearby valleys watch the sun appear to set twice as light passes through the mountain's natural arch during specific months. This visual effect has made the area special to those living below.

The direct trail to the arch starts at Cardoso (CAI path 12) and climbs more than 800 metres of elevation gain to the summit. From Volegno the rising sun can be seen through the arch on 22 June; from Garfagnana villages the double sunset appears on specific days of the year.

The arch measures 32 metres across and about 25 metres above the Passo dell'Arco, with rock roughly 8 metres thick, making it one of Italy's largest natural arches. A local legend says Saint Pellegrino struck the devil so hard that he flew into the mountain, leaving the hole.