Wow this is a tough one, but I have to go with this shot:
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Sunset in Antarctica (at Port Lockroy) on my birthday no less in 2008.
After dinner a few of us were hanging around the small bar in the ship having some birthday drinks, when the intercom system comes to life and it is our expedition leader saying that if we are not out on the deck with our cameras we are missing an amazing sunset.
So we all scrambled out on deck and were treated to such a beautiful site. My little Canon Powershot really kicked ass on that trip!