Foz do Iguaçu

The Iguaçu falls spread 2.7 kilometres across the Brazil–Argentina border in 275 separate cataracts, and the Devil's Throat alone takes half the river over a fourteen-storey drop. Eleanor Roosevelt is said to have seen them and murmured poor Niagara; the Brazilian side gives the panorama and the Argentine side the walkways, so both are worth a day.