The Early Bronze Age Hoard of Castione (from about 1800 BC.) contains material from north of the Alps. This large find indicates that the area was an important trading and transportation center during the Bronze Age. A Late Bronze Age settlement (from about 1300 BC.) is indicated by evidence of digging and traces of a number of cremation sites. The bulk of the finds come from the five groups of tombs at Castione, Castione-Bergamo, Cerinasca d'Arbedo, Molinazzo d'Arbedo and S. Paolo d'Arbedo, which are dated to the Hallstatt and Latène eras. The tombs were discovered at the end of the 19th Century during the construction of the Gotthard Railway, but probably were only partially excavated. Most of the finds are in Swiss National Museum.