Madison and I have both been to São Paulo, the largest city in the southern hemisphere, and we love it. In 2011 Madison traveled to SP for Carnival with the goal of staying there for two and a half weeks speaking only Portuguese. She’d been studying the language at university, and wanted to test herself. “I planned the first two days of the trip, and left the rest completely open-ended. I made some lifelong friends and managed to survive without speaking any English,” she said.