Ermita de San Pedro de Andatza Monument · Aia, Urola Kosta, Gipuzkoa Image of Aia, not of the place itself. Chapel in the Andatza district with a Plateresque altarpiece by Andrés de Araoz and a notable baptismal font. Photo: Tim Tregenza (CC BY-SA 3.0) What to see and do in Aia