Spanish Architecture

Here's a cover from Vigo on the north-east coast of Spain. On the left are a pair of stamps from a 2007 set showing Spanish architecture with the Market of Santa Caterina in Barcelona on the left and Terminal T4 at Barajas Airport in Madrid on the right. Top-right is a stamp from a 2002 showing Castillo de los Priores in Calatorao, Zaragoza. And below that is a 2002 stamp commemorating the founding of the city of Tudela in 1200.