The Church of Santo Spirito was built starting in 1398 by the noble brothers Michele and Giovanni Rabatta, with the aim of offering the inhabitants of Borgo Castello a place of worship. Completed in 1414, the church is distinguished by a Venetian-style façade, characterized by a rose window, two vertical windows, a bell gable and a porch. Above the founders' coats of arms are the statues of Michele Rabatta and his wife Maria Bella di Castelpagano, later transformed into an Annunciation. A large wooden crucifix, now preserved in the Provincial Museums, is reproduced inside as a copy of the seventeenth-century original.
Inside, the church is embellished with three Gothic apses - two of which are suspended - covered in schist, a typical sandstone. The vault is enriched by ribs intertwined in a star-shaped structure, with figurative keys that add further elegance. On the altar there is a canvas of the Assumption, dating back to the end of the sixteenth century and attributed to Tintoretto; more likely, however, it is the work of his son Domenico Robusti.
Overall, the building represents an interesting example of a fusion between elements of Venetian tradition and Nordic influences.
During the First World War, the church suffered limited damage, unlike the surrounding houses, which were heavily hit and later demolished. Today, the small church remains isolated and surrounded by a large green space, which enhances its ancient charm.