It will be the 87-year-old pope's first visit to the lagoon city since his 2013 election and he will also be the first pontiff to visit the Venice Biennale -- a prestigious art show with exhibitions sponsored by numerous nations in myriad spaces. It features creations by nine contemporary artists who worked closely with inmates on the project. The unusual decision to house the Holy See pavilion in the jail highlights Francis' repeated calls for society to rally around the poor and neglected, including prison populations.