In 1922, Monsignor Dudemaine, priest to the first parish of Abitibi, and architect Beaugrand-Champagne, of Montreal, got together to build the Sainte-Thérèse-d’Avila Church. Later, in 1939, this church became a cathedral. Monsignor Desmarais became the first bishop of the young Amos diocese. This Roman-Byzantine style structure is unique in North America. It is a veritable work of art, where mosaics, Italian marble, and French stained windows may be seen.