Valère Cathedral, Sion

The Valère basilica also called Valère castle is a fortified church situated on a rocky hill above Sion (German: Sitten) in the Canton of Valais in Switzerland. The organ on the west side of the Valère basilica, believed to have been built in 1435, is the oldest functioning organ in the world. also named Nôtre Dame de Valère, Sion