Back in 2001 I used Mathematica to create a very rough image of an antipodal New Zealand atop the countries of Portugal, Spain, and Morocco:
Antipodal New Zealand here (in case you didn't recognize it) is in red. I'm pleased to see that the latest version (12) of Mathematica does this sort of thing using a built-in GeoAntipode function and the country graphics are much improved:
What a difference! Carl Lange calculated that about 60% of New Zealand has above-sea-level land at its antipode.