The parish church of Barós is a simple temple composed of a single nave and a ultra-semicircular apse. It was built in the 11th century and later extended in subsequent phases of construction. The chapel of the Virgin of the Rosary (north side) was added in the 16th century and in the 18th century, the portico (removed in the last restoration) and the bell tower were built.

The influence of artistic masters from Lombardy is evident throughout the church. The frieze of blind archways that surrounds the exterior of the building and the modest ashlars used in the construction are perhaps the most significant elements. Some of the blind archways end in decorative reliefs of intertwined ropes, animals and human figures. These ornaments are exceptional among the churches of this area.

The interior is covered with a barrel vault above the nave and a quarter-sphere vault over the apse. An opening in the form of a cross presides the triumphal arch that leads to the chancel and accentuates the sense of sobriety and peacefulness of the church, which is magnified by the reduced natural light. Its layout and form are symbolic and identify Christ with the light that illuminates the temple. The chapel of Our Lady of the Rosary houses nine ashlars decorated with reliefs and which originally lined the walls of the exterior of the church. One of these is a monogram of Christ inscribed in a rectagle instead of the more common circle. There is also a 15th-century baptismal font.

The frescoes found in one section of the nave’s vault are similarly remarkable. At present, they occupy the north wall having been transferred to a new surface. The decorative elements of these frescoes are made up of rosettes enclosed within intertwined circles.