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 Basilica of Santa Maria in Trastevere is one of the oldest churches of Rome. The basic floor plan and wall structure of the church date back to the 340s, and much of the structure to 1140-43. The first sanctuary was built in 221 and 227 by Pope Callixtus I and later completed by Pope Julius I.
The inscription on the episcopal throne states that this is the first church in Rome dedicated to Mary, mother of Jesus, although some claim that privilege belongs to the Basilica di Santa Maria Maggiore. A Christian house-church was founded here about 220 by Pope Saint Callixtus I (217-222) on the site of the Taberna meritoria, a refuge for retired soldiers. The area was made available for Christian use by Emperor Alexander Severus when he settled a dispute between the Christians and tavern-keepers.
The church underwent two restorations in the fifth and eighth centuries and in 1140-43 it was re-erected on its old foundations under Pope Innocent II.