Day-trippers to Venice who fail to pay the €5 to enter the lagoon city’s historic centre will face fines starting at 10 times the entrance fee, officials said on Thursday. The payment system is being launched later this month for a time-limited pilot program. Venice announced last year it would introduce the long-discussed day-tripper fee after the city narrowly escaped being placed on the UN’s list of endangered heritage sites, due largely to the impact of overtourism. Visitors staying overnight in the historic centre are exempt from the charge as they already pay a tourist tax. How will Veni…