The parish church, a Baroque building dating from the late 17th century, still has some of the architectural details of its Romanesque and Gothic predecessors, which have now disappeared.
Its size and rich iconography make it the village's most important monument: parts of an altarpiece attributed to the Bréa school (early 16th century), a monumental Rosary chapel in polychrome carved wood (late 17th century), and a collection of priestly vestments. Its main treasure is the sacred statue of the Madonna de Fenestres, in polychrome wood, surrounded by numerous legends and miracles, still venerated by the people of Saint-Martin who take it in procession to the Sanctuary at the beginning of summer and bring it back for the winter.
The interior decoration is in the style of Guibert's ‘Romanesque’ style, which can be seen at Saint-Martin-Vésubie in the Sainte-Croix chapel, as well as in the churches of Lantosque and Sospel Cathedral. This Baroque building has a square bell tower with a stone spire and a Renaissance-style façade. In the Middle Ages, the church was dedicated to Saint-Martin, after whom the village was named.