I don't do a lot of international travel for work (only do maybe once a year or every other year for pleasure), so for several years my goal was to ride in the upper deck of a 747. Finally did it last summer on a trip from Tokyo to BKK and was so tired I conked out and did not get to enjoy it...
I'm also at 49 of 50 US states - only New Mexico remains. So, that's on my list for the next year or two...