Montmayeur Castle was built in 1271 by Anselmo and Aimone D´Avise on a steep promontory over the orographic right bank of the Dora Valgrisenche, in a position dominating the entrance to the valley of the same name.
Today it is reduce to ruins, but preserves the cylindrical tower, crowned with beautiful swallowtail battlements. It is still possible to see the remains of the ancient castle and the boundary wall.
Access is only possible on foot, along the path that leaves from the village of Grand Haury, just above Arvier.
References:The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.