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The eruption of Old Faithful in Yellowstone National Park gets my vote. I am retired and for the last four years I have been living in the National Parks. There isn't even a close second place in my book. Every 60 to 90 minutes Old Faithful goes off to the clicks of thousands of shutters. An eruption lasts around 5 minutes. Of course there are many photos takes of the spot when it is not erupting.