Reserve a tour to visit one of the finest engineering works in South America, the impressive Itaipu Dam. This powerplant near Iguassu Falls produces about 95% of the Paraguay electricity and 24% of the Brazilian needs.
Plus, the company running the dam hosts a remarkable environment preservation program with reforestation, wild animal reproduction and foster fish production. You can choose to have a panoramic tour which includes a film and entrance fee to the observation deck, or the technical tour where you actually enter the powerplant. Notice that both tours have extra cost.