Megalithic stone towers still speckle the countryside. They're called nuraghi and they're ancient. Then there are the "sacred wells" in which you can descend into the underworld, your fingers grazing basalt walls so finely worked you couldn't shove a piece of paper between the perfectly honed stones if you tried. They're even older.

Roman spring-fed baths still function, like those at Fordongianus, north east of Oristano on our map. The site is walled and you'll pay a little to get in and wander around, but they've left a bit of the site unfenced near the road, where locals can direct the waters into jugs to fill their bathtubs with the healing waters back home.