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Distance from Baltimore: 4,030 miles, about a 12½ -hour flight (with stop) Why it's hot: It's the site of the 2016 Summer Olympics, when it will be the first South American city to host the event. Iguazu Falls, at 269 feet, is taller than and twice as wide as Niagara Falls. Stop by Sao Paulo,... Vanderlei Almeida, AFP/Getty Images