The cathedral of the abbey was built on the site of the cell of St Gall, the founder of the of this vast and famous abbey. Already in the middle of the ninth century it was a whole wooden complex, including the crypt of St Gall and the chapel of the Archangel Michael. By By order of Abbot Celestine, construction of the present Baroque building began in 1755. The present Baroque building was begun in 1755 under the direction of the architects Peter Tumba and Johannes Beer. The main The main cathedral building was surrounded by various outbuildings, and the abbot's residence was located separately. The abbot's residence was located separately. The residence of the Bishop of St Gallen is now located in the left wing of the building. is located in the left wing of the building.
The interior of the church is decorated with frescoes with scenes from the life of St Gall by D.Wannenmacher. D. Wannenmacher. The central dome depicts Paradise, the Trinity and the saints and the apostles. apostles. Skilful carvings decorate the choir pews, the pulpit and the altar with black and gilded columns. gilded columns. In the south aisle is a bell brought by St Gaul from Ireland, one of the oldest bells in Europe.
