Europe | Footnote | Spain Footnote: A Walk in Plaza de la Seo September 1, 2013 PinayTraveller Plaza de la Seo is one of the most important squares in Zaragoza, Spain. Just south of Rio Ebro and opposite Plaza del Pilar, the square is home to the Catedral del Salvador which is part of the World Heritage Site Mudéjar Architecture of Aragon. Related Leave a comment