Of the prehistoric architecture in Sardinia there are numerous testimonies such as the "domus de janas" (hypogeic tombs), the Giants' grave, the megalithic circles, the menhirs, the dolmens and the well temples; however, the element that more than any other characterizes the Sardinian prehistoric landscape are the nuraghe; the remains of thousands of these Bronze Age buildings of various types (simple and complex) are still visible today. There are also numerous traces left by the Phoenicians and Punics who introduced new urban forms on the coasts.