Church

The Church of Saint Anthony the Abbot was commissioned in the 15th century by the lords of Illasi for the workers tending their lands near Costeggiola. A marble plaque embedded in the first column on the right commemorates this event.

Over the years, the church was expanded and restored several times, but three interventions are the most significant: an enlargement in 1663, a refurbishment in 1707, and an expansion in 1938 with the construction of an additional aisle. Before this last intervention, in 1909, the baptismal font was obtained, which allowed for some autonomy from Castelcerino, the reference parish, and in 1929 a bishop's decree established the Parish of Costeggiola.

Externally, the building features a stepped façade facing west. The floor plan consists of three naves separated by two rows of semicircular arches on pillars; the quadrangular presbytery is raised by two steps. The ceiling is decorated with false coffers. The interior walls depict a painted cycle including the Stories of Saint Anthony the Abbot, the Crucifixion, the Resurrection, and the Descent of the Holy Spirit. On the back wall of the apse, there is a fresco of Saint Anthony the Abbot.

The bell tower is attached to the northern side of the presbytery and is partially incorporated into it; only part of the stout and massive shaft sticks out from the structure.