The vibrant southern Italian city of Naples seems to run on espresso. Marcello Uzzi, who offers high-end tours of his city, says the city's excitement is due in part to its love of coffee. A regular stop on his tour is Caffè Gambrinus, which was established before Italy was, back when Naples was a kingdom. "It's like a temple," Uzzi said.

And coffee here is like a religion."Talking about coffee, you know, it's just like talking about pizza – it's part of our tradition," Uzzi said. Espresso – simply called "coffee" here – takes about 30 seconds to brew, and a little less than that to drink.