The South Pole trip is one of my most memorable travel experiences and I've done more than my share of world travel. It was New Years Eve 2001 in First Class with SWMBO, and cost about 4.5K each if I recall. You are required to rotate seats at the pointy end, but it was worth every penny.
Cockpit visits were allowed to all and sundry, even though 9/11 was less than 3 months earlier.
Most memorable travel experience not travelling somewhere in an airplane was the Sydney Harbour Bridge climb at dusk.