Iguassu

Iguassu is an amazing place.

Notice the little black "specks" in the picture? These are actually birds, which are feeding off (normally) water insects which go airborne as the water goes off the falls. The birds actually have nests on the otherside of the falling water. They dive through the falling water to reach their nests.

I took a boat trip which takes you ridiculously close to the bottom of the falls also (much, much closer than from where this picture was taken). I highly recommend it, although you'll get completely and utterly soaked.

You really need to see the water in motion though to get a sense of the sheer quantity of water going over the cliff each second. Apparently, at this time it was around 3000 litres of water a second going off the cliff. After really heavy rains, its more like 11,000 litres of water per second.

Here, a panoramic movie of the falls.

The Devil's Cauldron was particularly spectacular as all of the water is funnelling through an inlet part of the cliffs. It is aptly named - you cannot see the bottom for all of the water vapor, and with all of the jets and "explosions" of water at the bottom as various effects collude with each other, it really does look like an enormous cauldron. Best still, there's some sort of periodic effect going on there - a huge column of water "mist" balloons up to well over your heads, every 30 seconds or so, before "collapsing" back down again:

But again, the movie demonstrates it much better.

You can see the birds flying around in the movie too.

Amazing place.