Where is my Euro coin?

A year ago, we went back to Italy on vacation with our two kids. We arrived at the Venice airport with plenty of suitcases, strollers and backpacks. After claiming all our baggage, I looked for a cart. To my surprise, carts could only be unlocked from the rack using an Euro coin. But there was no coin dispenser available nor currency change bureau.
How do travelers from other countries get Euro coins before their trips? Banks only dispense paper notes.
While we managed eventually to get an unlocked cart, Francesca was puzzled by this episode and decided that during that trip she would have paid more attention to such details and took note of them. Before not long, we ended up with more than 80 topics that we thought were deserving some sort of explanation to first time travelers to Italy. And that was the time when we decided to create Italy from Inside.