Iguazú Falls, Argentina: One-minute wonder (Telegraph.co.uk). Not that it takes a minute to view the falls, but only a minute to read this article to see why you should see them.
"Why go?
To follow the boardwalks, walkways and nature trails offering views of the falls; and take a boat/Jeep trip with an operator such as Iguazú Jungle Explorer (www.iguazujungleexplorer.com) Note that helicopter trips are usually banned form the Argentine side. Avoid Easter and July (very busy) – May is usually a good month, because it's in the rainy season and you'll see the falls in spate."
View of the Argentine side of Iguazu Falls is displayed with the kind permission of Peter and Jackie Main. Enjoy more views in the Iguazu Falls Photo Gallery
This place is one of my favorites in South America, last year I had the oportunity to visit a lot of countries and one of them was Argentina. Also I visited Peru that has to many places to know, i loved to visit Cusco and other places like Lake Titicaca and Mancora. As you read I had the oportunity to know almost all this country. So if you have the oportunity do it. I recommend you to use a travel agency, it was good for me because helped me in everything and prepared me a lots of tours. The agency was TurPeru and this is the web if you want to see: http://www.turperu.com.pe/pages/index.php