I thought I had seen the best waterfalls on my various trips to Canada.. Niagara Falls of course. That was till the Costa Rica and Buenos Aires trips. When I and MM#1 Fan went to Buenos Aires, we took two days to go see the Iguazu Falls. Upon first sight, I was like WOW. And then the words I read of First Lady Eleanor Roosevelt came to mind- " Poor Niagara!" I was just blown away by the sheer beauty of Iguazu Falls. Iguazu may not be the largest waterfall, but it is in a league earing the tile of the world's largest waterfall system in the world with several massive waterfalls all concentrated in this one area. To see the Iguazu Falls for the first time is to see nature at it's finest. And of course much like Canada and the US, the age old question is which side is better for viewing? Argentina or Brazil? Paraguay doesn't count, since so little of it is actually in that country. I can say if you want up close and personal to the falls and take in it's immense power, with boats rides and walkways, and more vantages points, then the Argentinian side is far better, and cool suspects from wildlife can be seen also. We did both. I must admit that the Brazil side gives one a unparalleled and undisturbed panoramic view of the 275 individual waterfalls crashing from 260 ft cliffs. But definitely a more enter at your own risk. If you only have one day to explore then go with the Argentina side. Getting there is fun too. Most take a small flight since it's about about a 15 hour drive from Buenos Aires, but we opted for a overnight bus trip, to save money for other things and take in scenery along the way.