Zootierliste list of venomous snakes in Tropicarium Park, Jesolo is impressive: Black mamba, Eastern and Western green mamba, Diamondback rattlesnake and King cobra. But all data are from the year 2011. And in Tropicarium internet page there are no info about this snakes. Does anybody know if they still have venomous snakes? I'm planing to visit some Italian zoos in the next weeks and this info will help me plan my trip.
I think I found their phone number. Maybe you could call them and try to ask them? You may have a language barrier, though. https://www.cybo.com/IT-biz/tropicarium-park
Given that the only venomous reptile in the more recent pictures on Google, TripAdvisor etc. is a gila monster, I'd suspect that the venomous snakes were part of a past temporary exhibition.