This evidence is carved into the slopes of a trachyte hill, just below a single-tower nuraghe. The four hypogeic tombs of Brodu are located in the territory of Oniferi, about four kilometres from the residential area. After leaving the provincial road towards Macomer, you can reach them on foot by wading across a stream and climbing the slope beneath the nuraghe of the same name, which dominates the territory from the top of the hill. Two of the tombs are notable for their size and state of preservation. However, little remains of the other two and of the nuraghe, the tower of which is partly buried.

The necropolis reveals phases of different cultures, covering a period between 3200 and 1600 BC. The first hypogeum is made up of an elliptical cell with two pillars in the centre. Of the second, you can see the imitation of a single-pitched roof in the ceiling. Then there are the two best-preserved domus. The third has a vestibule from which you can enter an anteroom, in the back wall of which there is a door that has a raised triple bovine protome above it and leads into the larger central cell. Along the sides of the burial chamber you will see raised rooms and the entrance to a secondary room in the back wall. Tomb 4 is the one that will impress you the most, especially for its architecture and symbolic elements carved on the walls. The tomb is T-shaped and is preceded by a monumental dromos. After passing through an atrium, you will enter a quadrangular anteroom with a small niche and a sloping ceiling. There is a door in the back wall, leading to the central burial chamber. This door also has a carved cornice and a beautiful bas-relief above it, depicting four stylised bovine horns. Here, there are also traces of a red colour on the walls, like in the third tomb. In the walls, there are two entrances that provide access to small lateral cells.

The territory of Oniferi is rich in evidence of the Nuragic and pre-Nuragic era: in addition to the site of Brodu, don't miss the opportunity to visit the large and unique necropolis of sas Concas, a few kilometres away.