The singular most impressive and dramatic waterfall I've had to pleasure to see, Gullfoss in South West Iceland. The sheer power of this falls is hard to take in, you can hear it a long time before you actually see it, definitely a 'wow' moment when it does come into view, something like 140 cubic meters per second falls down into the crevice below!
We were really lucky with the weather here as it had been raining off and on that morning and heavy cloud, luckily it held off here and had some nice golden light, along with the rainbow which appeared and the disappeared again, the one big bonus of these falls opposed to the others we visited on the trip is that there is hardly any spray to contend with as you are a lot higher up allowing me to use filters without wiping the lens every few seconds, a polarizer was just about impossible anywhere else but ideal here with the sun in the right place at this time of day allowing a much more pleasing exposure time.