The Church of Sant’Antioco Martire in Atzara, built between the 16th and 17th centuries, is a fine example of Catalan Gothic architecture in Sardinia. The façade, broad and harmonious, is constructed entirely of trachyte carved with great precision; it is crowned by a cornice supported by trefoil-shaped battlements, a distinctive feature of local architecture. At the centre is the portal, surmounted by a rose window with a radiating pattern of small columns and arches, whilst two semicircular side windows illuminate the interior naves.

On the right-hand side stands the square-plan bell tower, also built of trachyte, characterised by sections marked by string courses and single-lancet openings, both pointed and round-arched. The tower is topped by a stone balustrade, similar to that of the nearby rural sanctuary of San Mauro. In the past, it was surmounted by a dome with a large copper sphere and a cross, which was later removed for safety reasons. A curious feature that has now disappeared was the small stone sculpture known as Su moru sacru, situated on the façade and used as a rainwater drain.

L’interno è suddiviso in tre navate: quella centrale è coperta da volte a sesto acuto, mentre le laterali presentano volte a tutto sesto. L’aula è arricchita da due cappelle laterali e da altre due in prossimità del presbiterio, tutte con volte a botte. Elementi decorativi come cornicioni dentellati e nicchie timpanate testimoniano un gusto ormai vicino al tardo manierismo.

L’altare maggiore ligneo, di stile spagnolo, è oggi collocato nella cappella del Sacro Cuore. Tra gli oggetti di maggiore pregio si segnalano alcune argenterie del Cinquecento, tra cui un ostensorio di fattura spagnola e una croce proveniente da una bottega cagliaritana, testimonianze della ricchezza artistica e della storia religiosa della comunità.