El poblado medieval de Aistra Historical milestone · Zalduondo, Cuadrilla de Salvatierra/Agurain, Álava At the Aistra site, remains have been documented of what has been described as one of the oldest medieval settlements in the northern Peninsula, occupied in the 6th-7th centuries, along with Neolithic and Roman materials. Photo: Iñaki LL (CC BY-SA 4.0) What to see and do in Zalduondo