Sardinia could really be considered a huge open air museum. The Nuraghi are stone structures that have been built over many centuries, but mainly between 1200 and 900 B.C. There are over 7,000 of them were built back then and they are one of the main tourist attractions in Sardinia. If you want to know all about these ruins it is best that you book one of the guided tours rather than going on your own. Another special characteristic of the Nuraghi are the burial chambers, also known as the Tombe dei gigantic or the Giants’ Tombs.