A lighting system on the outside and inside the structure emphasizes its shape, amplifies the effects and creates a suggestive atmosphere, especially in the evening. The Armungia nuraghe is a very rare case of nuragic architecture within a town: it rises amidst the rooves of the houses, a few metres from the old town hall, now home to the Sa domu de is Ainas museum, in the north-eastern edge of the town, the 'old part' of Armungia, to which it gives its name. The nuraghe is the most important archaeological feature of the territory, and overlooks the valley of the river Flumendosa: its strategic position may once have controlled the territory, and today it offers a splendid panorama that reaches as far as Gennargentu.

The nuraghe, which dates back to the mid-Bronze Age (15-14th century BC), has a single-layer structure and a truncated cone shape with a diameter of twelve metres and a residual height of ten. It is built with well-worked blocks of calcareous schist arranged in rows, culminating in a false dome (tholos), i.e. missing some of the rows that completed it. The entrance leads into a corridor four metres long, like the wall thickness, which leads to the main circular chamber with a diameter of over five metres. On the wall opposite the corridor you will see two large cells; the one on the left houses a cistern for water, lined internally with opus signinum plaster: it shows signs of having been reused as a burial in the Byzantine era (6th-7th century). This hypothesis is also supported by the finding in the cistern of a bronze buckle dating from the 8th to 9th century. Also on the left there is a stairwell that leads up 17 steps to the terrace. Outside the nuraghe, on the north-east and south-west sides, you will notice some curvilinear walls, which are probably later reinforcement works.

You can enter the nuraghe from the ethnographic museum, where you will continue in the cultural itinerary inside a real country-museum with architecture that recalls its agropastoral origins: modest shale houses, inside which you will often find ball ovens and courtyards with rooms used as warehouses or stables. Walking through the streets of the town, you will pass by the ethnographic museum, which contains about six hundred artefacts from the agropastoral culture at the Bottega del fabbro (the old forge), a nineteenth-century stone building that houses the tools of su ferreri (the smith). Lastly, you can visit the historical museum dedicated to the great writer and statesman Emilio Lussu, who had close ties to his home town, and his wife Joyce Salvadori, protagonists of the twentieth century history and key figures in the national democratic and anti-fascist period. The town is surrounded by abandoned mines, evidence of industrial archaeology, numerous caves and lush nature, which is particularly appreciated by trekking lovers.