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Before your Antarctica polar exploration, visit another natural wonder with our optional pre-trip extension. Travel to spectacular Iguassu Falls National Park, a UNESCO World Heritage Site of 275 thundering falls on the border of Brazil and Argentina. Second in size only to Victoria Falls, this series of cataracts once prompted Eleanor Roosevelt to take pity on her country’s most famous falls, saying “Poor Niagara” as she gazed upon mighty Iguassu. The falls here are all impressive, but the most spectacular is the Devil’s Throat: the 2,300-foot long spectacle that separates Argentina and Brazil.