You can visit the iguaçu waterfalls from two countries - there is an argentinian and a brazilian side, both within their own national parks. So we crossed the boarder and visited the brazilian side. You can get really close to the falls (and get really wet - which is kinda nice with 30+ degrees C airtemperature). Especially the Diavolo fall. The most impressive and biggest from all, which you currently can't see from the argentine side. Beside the national park there is also very nice aviary with lot of toucans, macaws, butterflies and others!