There are tons of pictures posted below, and I took some video as well but I'm not too sure about the quality. Along with the jungle trek (posted earlier) and Machu Picchu (entry coming soon), Iguazu Falls was one of the top three highlights of my trip.
I made a long trek (by bus not foot!) across the north of Argentina, arriving in Puerto Iguazu, the town near Iguazu Falls. Situated near the borders of Argentina, Paraguay and Brazil, the falls are an immense set of beautiful cascades in a rainforest like setting. The falls can be seen from Brazil as well, but I visited the Argentina side. You can actually walk right over the crests of many of the falls by steel catwalk, and there's even a viewing platform that is positioned just feet from some of the crashing water as it reaches the river below (see the video I posted). The largest of the falls, called Garganta del Diablo (Devil's Throat) creates a spray of mist that rises almost a hundred feet. The weather was perfectly clear and sunny, generating beautiful rainbows in the mist of the waterfalls. Experiencing something so awe-inspiring and evocative, truly a natural wonder, felt almost other-worldly. Although there were thousands of other people there (which would usually annoy the hell out of me), the gentle white noise of the crashing water gave me a cocoon of serenity from which to fully take it all in and absorb myself in the experience.