The material evidence of the construction of the State of the Pyrenees: the Co-Principality of Andorra. Spread over Andorra, Alt Urgell (La Seu d'Urgell) and Arieja (Foix), the twelve elements of this series are the testimony, throughout more than a thousand years of history, of a cultural tradition and politics without parallel in the world. The Principality of Andorra is the only mountain valley organization in Europe that has survived from the Middle Ages to today preserving its particularities, such as the co-principality that was redefined as a co-principality by the Constitution of 1993. Andorra is a full-fledged state, the 184th of the United Nations. The institutional triangle - two co-princes and the Andorran communities - has lasted in the same territory for 750 years in peace and neutrality: on a global scale it is an exceptional fact. By visiting the twelve monuments you will discover a unique story that testifies to the diversity of these communities and illustrates an exceptional historical account.