Sion is a town located in the southwest of the Swiss canton of Valais. It is known for its fortifications which rise to the top of 2 hills: the ruins of the castle of Tourbillon, dating from the 13th century, and the complex of the castle of Valère, whose basilica has an organ more than 500 years old. years. In the old town stand the Notre-Dame du Glarier cathedral, built in the 15th century, and the conical tower of the Sorcerers. The towers of the Majorie and the Vidomnat house the Valais Art Museum and its collection of regional art.