Hollow Earth Evidence
As time and technology move on, we may unearth more Hollow Earth Evidence to prove to even the most hardened skeptic that the Earth is indeed, Hollow.
We have had eminent scientists proclaim on the inner core of the Earth being hollow and we have seen nutjobs fly their weird theories and proclaim themselves prophets and messiahs. Of course, if one were to be the definitive discoverer of such a phenomena, he likely could begin a new cult.
So, what evidence do we have that the Earth may be hollow?