Estación megalítica de Pagoeta Historical milestone · Aia, Urola Kosta, Gipuzkoa Image of Aia, not of the place itself. Prehistoric complex made up of the Olarteta dolmen and eight burial mounds (Arreta, Murugil I-II, Saberriko Haitzak and Urruztume I-IV) within the natural park. Photo: EAJ-PNV Gipuzkoa from Euskadi/Euskal Herria (CC BY-SA 2.0) What to see and do in Aia