The Church of San Martino is located in the chief town of Arnad-Le-Vieux. The current building has a trapezoidal layout, with three naves that preserve a roof made of Gothic, low pointed cross vaults. The pillars support large arches that rest on capitals. The facade has a central tuff portal from the 15th century, decorated with a keel-shaped arch, representing two intertwined tree trunks with an overhead rose window. There are slender, single mullioned windows. The bell-tower, with a square shape, has a high, pyramid-shaped spire. The ceiling on the left nave is decorated with Late Gothic frescoes. The subjects represented include “St. George fighting a dragon”, the “Feast of Herod”, a “Crucifixion” and the “Beheading of John the Baptist”.