The Royal Church of San Lorenzo is easy to miss on Turin’s Piazza Castello. Beside the Royal Palace, its understated exterior gives little hint of the Baroque interior within. Built in the second half of the 17th century for the Savoy court, the church reflects Turin’s history as a capital of dukes and kings.
Its most remarkable feature is the dome, designed by Guarino Guarini, a Theatine priest, mathematician and architect. Eight intersecting ribs form a star-like pattern overhead, drawing light into a space shaped by curved walls and intricate geometry. The effect is both carefully ordered and theatrical: take a few minutes to look up and follow the lines of the vault.
San Lorenzo remains a working church, so check opening hours before visiting, dress modestly and avoid sightseeing during Mass. Its central location makes it easy to combine with the Royal Palace and the nearby Chapel of the Holy Shroud, another Guarini design with separate ticketing.