One of the most interesting but less studied places of the Serra del Montsià, from which some answers could be gotten. It's a group of stones of considerable size, distributed forming a circle of 140 metres of diameter. The construction of these monuments is placed at the recent bronze age prehistoric period, but the oldest are from the Neolithic period, almost 10.000 years old. It is believed that this kind of structures, also known as cromlech, were funerary monuments that could also be used as temples. The most famous one is Stonehenge, in England. It is also said that the one in the Serra del Montsià could have been designed to be used as a solar observatory.