Basaltic columns at Aldeyjarfoss in Iceland
I have seen a lot of waterfalls in Iceland, and this might be my favorite. The location is very remote - you don't actually believe there is a waterfall anywhere in the area until you drive to the right spot and peer over. The rock formation and canyon are astounding.
The river Skjálfandafljót drops 65 feet at this waterfall.
Detail shown. For other pictures, see this album: