Prominent historical authors genuinely believed the planet contained a hollow subterranean world filled with giants.
During the romanticized Victorian era, the eccentric Hollow Earth hypothesis gained shocking pseudo-scientific traction. Highly famous science fiction authors deeply insisted that massive unmapped polar openings secretly led downward into a lush, brilliantly illuminated inner planetary sphere populated by forgotten alien civilizations and towering ancient behemoths.

This article describes beliefs and cultural traditions, which are not necessarily scientifically established facts.
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