Seljalandsfoss in southern Iceland is a great and pretty unique place. The waterfall comes down of the cliffband in one big flow and several side runs. This view is from behind the waterfall. The big attraction is not to just look at the fall or dare to go really close to the water edge where the thundering beam of water - even though that is really fun.
The big thing is to go behind the fall into that caving that is hollowed out by the water.
No, it is true: You do get wet behind there. But moreso in walking towards the cave along the sides. Once you are behind the water, it depends on the wind if you get wet or not.