Founded by Don Bosco between 1865 and 1868 and built to the plans of Antonio Spezia, this church was enlarged and enriched between 1935 and 1938. The façade is in the Neo-Palladian style and a statue of the Madonna by Camillo Boggio (1867) can be found inside the dome.
The interior is in the form of a single nave richly decorated in coloured marble and houses the remains of San Giovanni Bosco. The fresco in the dome which depicts the Glory of the Virgin was painted by Giuseppe Rollini. On the main altar there is a painting by Tommaso Lorenzone (1868) which represents Maria Ausiliatrice.