If you are interested in some history you can visit the Nuragic village of Lu Brandali, the old Spanish tower or the Roman columns of Capotesta
If that's not enaugh for you, don't worry, history is all around us and there are dozens of archaeological sites in the nearby towns such as Palau, Arzachena,Tempio etc...
Here some links to learn more about them:
http://prisgiona.beepworld.it/
http://www.visit-tempio.it/en/archaeology/
http://turismoarzachenacostasmeralda.it/en/giants-path-life-death-nuragic-age/
https://it-it.facebook.com/cooltour.gallura/
http://www.ingallura.it/en/visit_to_tower_longosarda_and_lu_brandali/cooltour_gallura_sc_58.htm