The Church of the Holy Trinity is a building dating back to 1762 and located in Piazza Fietta, in the locality of Fietta. It has a single rectangular nave, oriented north-south with the main facade, soberly decorated and facing the plain, to the south.
The internal nave, equipped with a transept and presbytery, has four side chapels, two to the east (one houses a wooden Crucifix perhaps from old San Marco of Crespano), two to the west, all with marble altars, and a semicircular apse. The entablature runs around the nave, also encircling the presbytery and apse. The nave’s roof consists of a lunetted barrel vault, while the presbytery’s has a pavilion vault. Inside, the walls are punctuated by pilasters and overlying cornices. The ceiling is frescoed with the Assumption of the Virgin Mary with Apostles by Sebastiano Santi (1824) while the presbytery ceiling is decorated with the dove symbolizing the Holy Spirit. The nave flooring is made of white and pink square and rectangular stone slabs laid orthogonally to the walls. The churchyard and perimeter of the church are paved with light stone slabs, while the rest of the square is made of porphyry slabs.
