This is a really cool problem to have… I so want to drop a map pin on the south pole 
I’ve found a data portal for Antarctic data https://www1.data.antarctica.gov.au
DataPortals.org looks like it uses the Web Mercator projection and the initial extent displayed chops of the top and bottom of the planet…
If you press the zoom out button you get this…
Now I can’t really put the pin on the South Pole but a can use a map to find the centre of the Australian Antarctic Territory.
What do you suggest is the best way to add this portal?
- normal process, no other changes?
- normal process, adjust initial map extent?
- something else?