On 5th July 2003, Sacro Monte di Belmonte together with the other Sacred Mountains of Piedmont (Crea, Domodossola, Ghiffa, Oropa, Orta, and Varallo) and the Sacred Mountains of Lombardy (Ossuccio and Varese) were declared by UNESCO "World Heritage Sites". Such recognition was decided by an international committee of experts with the following description: "The nine Sacri Monti (Sacred Mountains) of northern Italy are groups of chapels and other architectural features created in the late 16th and 17th centuries and dedicated to different aspects of the Christian faith. In addition to their symbolic spiritual meaning, they are of great beauty by virtue of the skill with which they have been integrated into the surrounding natural landscape of hills, forests and lakes. They also house much important artistic material in the form of wall paintings and statuary".
The inscription in the UNESCO list imposes "the obligation to ensure the identification, safeguard, preservation, enhancement, and transmission of the cultural and natural heritage to the future generations".
Since 1712, also the highest part of Belmonte dominating the sanctuary became a place of worship thanks to the Franciscan friar Padre Michelangelo from Montiglio, who planned the lay-out along which the chapels of the "Via Crucis" should have been built. He built some of these chapels with the help of both pilgrims and the local communities who supported this project. When Padre Michelangelo left, the project was continued by the other Superiors of the sanctuary, and was completed towards the half of the 19th century. The 14th chapel of the Deposition is lacking, since it was incorporated in the building of the monastery.
The devotional route of Sacro Monte di Belmonte is formed by 13 chapels representing the Passion of Christ. They are characterized by the same building typology, dry and essential, with one hall, circular or quadrilateral plan, preceded by a pronaos from where you look at the sacred scene.
The archaeological excavations revealed that Belmonte hill was inhabited already in the late Bronze Age and in the early Iron Age. There are evidences of a big settlement on the gentler slope of the hill where people used to hunt, breed animals, mill cereals - wheat, barley, and millet - and cook the food in the huts. Crockery and cinerary urns have also been found in a small depression near S. Apollonia church, a place considered sacred near the pedestrian path connecting Valperga with Sacro Monte di Belmonte.
The presence of man in the area continued both in the Roman and the Lombard period. In the area called "del Campass", it is still possible to see the foundations of a Lombard fortified house, similar to a village surrounded by a wall. Excavation campaigns have brought to light interesting finds like everyday objects, arms, and jewels of fine workmanship. One of the halls that have been found could be a forge for the processing of metals and the creation of working tools and arms.
Belmonte hill has not suffered phenomena of glacial erosion. The rocks forming it date back to over 300 million years ago and are formed by an outcrop of orthoclase microperthite red granite. Among the minor minerals forming the rock structure there are quartz and plagioclase and, in lesser percentage, muscovite, biotite, iron oxide, apatite, and pyrite.
The atmospheric precipitation and the erosion phenomena given to physical and chemical agents have broken up the rocky outcrops and given origin to the so-called "sabbionere": they are gully-like structures characteristic of the area, formed by coarse sand consisting of quartz and feldspar which, according to the location, are reddish-violet or entirely white. "Sabbionere" are well visible especially on the northern slope of the hill, where the erosion phenomena are more evident.