The birth of the Art Gallery. The artworks in the Exhibition constitute the first group of pieces of the Art Gallery, opened one year later in three halls of the Palace: the painter Giulio Arienta is in charge of compiling the catalogue, posthumously published in 1902. The growing collections cause many changes in the following years: in 1915 the Society for the Conservationis declared charitable organisation, thus being able to inherit the bequest of the painter Bartolomeo Avondo, an extraordinary group of drawings from various artists such as Morazzone, Tanzio da Varallo, Pier Francesco Gianoli.
Expansion of the museum. In the 1940s a new regulation for the Art Gallery is established, calling for the election of a curator: the first curator is the painter Emilio Contini, who promoted the realisation of a new exposition, opened in 1952 in 24 halls.
Towards a modern museum. At the end of the 1950s, after the election of Giorgio Rolandi as President, the Society obtained property of the building: this brought a renovation of the museum spaces ended in 1960. Rolandi also supported the work of many art historians from the universities and museums of Milan and Turin who had already showed their interest in the artistic heritage of Varallo, in particular regarding Gaudenzio Ferrari and Tanzio da Varallo. The new exposition for the museum and the subsequent monographic exhibition about Tanzio were born thanks to the collaboration of Anna Maria Brizio, Noemi Gabrielli, Marco Rosci, Vittorio Viale and Giovanni Testori: this yeasty period reached its prime with the Third Piedmont Congress on Art and Antiquities, organised by the della Società piemontese di Archeologia e Belle Arti (Piedmont Society for Archeology and Fine Arts) and hosted by the Art Gallery in 1960.The Art Gallery today. In 1998 the Society for Promoting the Study of Drawing and the Society for the Conservation of Artworks and Monuments in Valsesia unite, giving birth to a charitable non-profit organisation (ONLUS) aimed at the promotion and conservation of the artistic patrimony of the Art Gallery with a progressive restauration of the Palace and its collections, in line with the latest standards in security and art preservation.