Iglesia de Santo Tomás de Arratzu Monument · Arratzu, Gernika-Bermeo, Bizkaia Church whose nave was built around 1530, with Neoclassical alterations added between the 18th and 19th centuries. It is the historic parish church of the anteiglesia. hacia 1530; reformas siglos XVIII-XIX Photo: Ebaki (CC BY-SA 4.0) What to see and do in Arratzu