The tourist tax in Venice didn't deter enough travelers. Now, the hot spot is limiting tour groups.

Joey Hadden/Business Insider

• Venice's tax pilot program to combat overtourism didn't deter enough travelers.
• The tax raised $2.2 million over two months as tourists continued to pour in.
• Venice recently set a 25-person cap on tourist groups and banned loudspeakers for tours.

Tourists in Venice stuff themselves through narrow bridges in mobs. They scramble through...