Niagara is cool (which according to Aristotle would be why it flows downward), but to my mind the world’s most beautiful waterfall, which I’ve always wanted to see, is Iguaçu Falls in Brazil:
From the latest trailer it looks like Iguaçu Falls is going to be a major location for Indiana Jones and the Title That Goes On and On. Should be mighty purty ….
“They” always say the view from the Argentine side is purtier …