The Chorus Association aka the Associazione per le chiese del patriarcato di venezia is run by the patriarchate of Venice, dedicated to restoring and keeping many of the city's churches open to visitors. Rather than pay the €3.50 (€2.50 students) admission to individual churches, you can buy a €15 pass good for a year to all of them, or €24 for a family (two adults and children under 18); €8 students under 29; under 10s free.
Members include:
Image by Harshlight, Creative Commons License