The design of the Metropolitan Cathedral of Porto Alegre, dedicated to the Mother of God, the Italian architect John Battista Giovenale.
On August 7, 1921 the works are started with the laying of the cornerstone.
All the granite used in the building and the floor was extracted from the quarries on the hills surrounding the city of Porto Alegre.
On January 1, 1922, on the occasion of the seventh centenary of St. Francis of Assisi is celebrated the first Mass in the crypt of the new site Cathedral of Porto Alegre, still uncovered.
On March 20, 1929, the crypt is opened with the completion of the first mass in these sumptuous spaces.
Only at the Fifth National Eucharistic Congress and the Third National Week of Catholic Action, held in Porto Alegre, on October 24, 1948, the celebration of the liturgical functions of the crypt is transferred to large premises of the new temple.
On this date, the Metropolitan Cathedral is partially opened, giving access to the central nave and the presbytery.