“4 Reduced for 1 Full” is an initiative by the MUVV Museums of Vercelli and Varallo to promote local culture: by presenting a full-price ticket purchased at any museum within the MUVV network, you will be entitled to a reduced-price ticket at the other participating museums.
The museums in the MUVV network are:
Leone Museum (Vercelli)
Archaeological Museum of the City of Vercelli (MAC)
Francesco Borgogna House-Museum (Vercelli)
Treasure of the Cathedral Museum Foundation (Vercelli)
Palazzo dei Musei (Varallo)
Pinacoteca of Varallo
Calderini Museum (Varallo)
More info available here.