Carrosio: Geology, History and Trails

One of Carrosio’s geological highlights is the Sentiero del Geosito. Starting from Carrosio, the trail follows route 490 and then switches to variant 490A. It leads to a GSSP, a rock outcrop where a boundary between two geological ages can be precisely defined and dated. At the Geosito, visitors can walk among rocks belonging to ancient underwater volcanoes. This route therefore focuses both on the geological significance of its destination and on the landscape of volcanic rock.

Trails and Geological Themes

A GSSP—the abbreviation stands for “Global Stratigraphic Section and Point”—designates the place where such a boundary can be precisely defined. The Sentiero del Geosito offers a tangible introduction to a geological subject: the trail does not simply end at a viewpoint, but leads to a geological reference point. Those interested in Earth’s history can connect this aspect with a walk among rocks associated with ancient underwater volcanoes.

Another route leads from Carrosio via Pineta del Bruzeta and Cascina Carpenè to Colle Zuccaro and back. This route description lists a sequence of places and the return journey; the Sentiero del Geosito, by contrast, is defined by its geological destination. The routes can therefore be distinguished by their described features, without assuming a walking time or level of difficulty.

Historic Routes and Buildings

Local history also offers several specific points of interest. Carrosio lies on the Via della Bocchetta, an old trade route between Genoa and the Po Valley. The documented dates for its religious buildings span the Middle Ages to the early modern period: the Chiesa Santa Maria Assunta was first mentioned in 1212; its current structure was built between 1675 and 1729. The Cappelletta di Nostra Signora della Misericordia is the oldest religious building in Carrosio to have survived in its original form and was built around 1630.

Another architectural landmark is the Palazzo Migliorati Gavotti. The Spinola family had it built in the Genoese style at the end of the 16th century. Together with the two churches, it provides a basis for comparing different periods: the first mention of Santa Maria Assunta, the construction of the Cappelletta, the building of the Palazzo and the later creation of the church’s current structure. The names and dates help distinguish these different historical highlights.

Festivals and Annual Events

The local calendar of events includes religious and community celebrations. In Carrosio, the Feast of the Ascension is celebrated on the sixth Sunday after Easter with a procession to Colle d’Aimero. The Sagra della Zucca is also held every year. The pumpkin festival includes market exhibitions, food tastings and competitions to recognize the best pumpkins. If you would like to plan your trip around one of these events, check the relevant date in advance.

App and Astronomy Evenings

The official app “Carrosio – Torrente di Natura e Cultura” offers an interactive and immersive route that guides visitors as they discover the town, its surrounding area and its geological features. At the app’s inauguration on 28 June 2026, the integrated map led participants to the route’s first sculpture, the “pesce tondo,” which they unlocked there. The Osservatorio Astronomico di Carrosio is used for events, astronomy evenings and night walks during public openings. These activities take place during public openings.

Carrosio thus brings together geological themes, architectural history and events that offer different focuses for a trip. Discover more destinations: Caldirola, Casasco, Mombello Monferrato, Conzano, Bosio, Olivola, Quattordio, Fubine.

For the broader travel overview: Alessandria.