11. Does this fit in with the Hollow Earth theory?
Yes. Beneath the Earth, or hanging off the edges, is a land populated by either green-skinned women or Nazis. All those claiming to have seen this have misinterpreted it to fit in with the spurious and false Spherical Earth theory.
20. Does Idaho exist
No. The existence of Idaho is a lie, fabricated by a conspiracy of cartographers, as is England (see question 10).
21. What about North Dakota?
That doesn't exist either.
22. Any other places which are believed to exist but really don't?
Yes, Australia. And then there are the cryptogeographica, places such as Kadath, Carcosa, Hobbiton, Narnia, Hy-Brasil, Hell and such whose existence has not been satisfactorily proven.