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VOICE OVER: Emily Brayton WRITTEN BY: Aidan Johnson From celestial wonders to natural phenomena, the world offers rare spectacles most people will never witness. Join us as we count down incredible events that only happen once in a lifetime! Our list includes fleeting cosmic occurrences, extraordinary natural migrations, and stunning atmospheric phenomena that require perfect timing and location to experience. We'll explore everything from Halley's Comet and total lunar eclipses to the Serengeti's Great Migration and the mirror-like beauty of Bolivia's salt flats after rain. We also feature rare atmospheric events like red jellyfish sprite lightning and the haunting songs of whales. Which once-in-a-lifetime event would you most like to witness? Let us know in the comments below! read more...