The cathedral has been an integral part of Sion's cultural landscape since the 15th century. Its name "Notre-Dame du Glarier" translates as "Our Lady of the Glacier", reflecting its elevated position overlooking the town and the surrounding valley, with snow-capped mountains on all sides. The church was originally built as an episcopal residence before being elevated to cathedral status in 1968 by Pope Paul VI.
One of the most unique features of Notre-Dame du Glarier Cathedral is its magnificent organ. Installed in 1903, this musical masterpiece was built by Charles Mutin, the famous French organ builder who succeeded Aristide Cavaillé-Coll. The instrument has over 2000 pipes and has been meticulously maintained over the years, making it one of the finest historic organs in Switzerland.