Going to Antarctica is at the very top of my bucket list for all of reasons you've mentioned. But that's much more expensive. Trip for two will easily run into $20k without any excesses. A couple I know paid close to $40k for a higher end trip.
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"An idea is always a generalization, and generalization is a property of thinking. To generalize means to think." Georg Hegel
“To generalize is to be an idiot.” William Blake
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