Horsetail
Seljalandsfoss is usually busy; it's a popular place and very accessible due to its proximity to the main Route 1 ring-road.
Because of photos of this falls taken at sunset, it felt as if everyone was there at once to see the fabled spray rainbows. You can just see a double bow here.
A cave offers some access behind the drop, and you can see some people there in this shot.
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