Pottery from the Għar Dalam phase is similar to pottery found in Agrigento, Sicily. A culture of megalithic temple builders then either supplanted or arose from this early period. Around the time of 3500 BC, these people built some of the oldest existing free-standing structures in the world in the form of the megalithic Ġgantija temples on Gozo; other early temples include those at Ħaġar Qim and Mnajdra.