Iguazu Falls
Argentina / Brazil
The mist hits you before the sound does, then the sound hits you before you see anything, and then you round a corner on the Argentine side and 275 waterfalls are just there, spread across nearly 3km of jungle-lined horseshoe. A coati will try to steal your lunch while you stand there getting soaked. The Devil's Throat drops 82 metres straight down and the noise makes conversation impossible.
South America$1500-2000