Sardinia was home to the Bronze Age "nuragic" civilization, so-called from the nuraghi, or towers, that they built of large field stone. The largest nuragic site is at Su Nuraxi, near Barumini. In this photograph, taken from the top of the ruins of one of the towers, you see the village spread out to the east. The oldest dwellings are one-room, circular homes made of basalt from the volcanic hills north of Barumini. They are as much as 3,500 years old. The more recent dwellings, which range from the late Bronze Age through the Punic and Roman periods, are of smaller, lighter stone, and feature several rooms. On the left, you can see the ruins of one of five smaller towers built around the central nuragic keep.
As you can see, there doesn't seem to have been much town planning in Su Nuraxi: alleys between the houses are narrow and twisty, and the largest "square" is only a few meters across. Presumably the residents spent much of their time outside the village, in the fields and pastures.
For more pictures of Su Nuraxi, visit my Sardinia 2005 album.