A tourist takes a photo of the Iguazu Falls from an observation platform at the Iguazu National Park near the southern Brazilian city of Foz do Iguacu June 16, 2014. Forming a border between Argentina and Brazil, the Iguazu Falls, South America's largest falls, attract more than 1 million visitors a year. REUTERS/Jorge Adorno (BRAZIL - Tags: ENVIRONMENT SOCIETY TRAVEL)