There are countless histories about the the hollow earths, tales of underworld societies, conspiracy theories, secret cults (like the christians in ancient Rome) or places where the dead souls live, like the Hades in classic mythology and Hell as Dante imagined in his Divine Comedy.
This was , maybe, the strongest influence, a hollow underground where the souls of the condemned are suffering for their past sins, punished by evil entities and other mythological figures, all surrounded by a symbolic /metaphoric atmosphere of awe.
We can see the influence in the global shape, a triangle related to some maps of Inferno and their circles/levels funnelling all the way down to Lucifer, king of Hell. This idea of a subterranean realm is also held by the tibetan buddhism, place of Yama (lord of Death), and is someway liked with Dante’s voyage in underworld.

Some other hypothesis of Hollow Earth are proposed by folklore and “subterranean fiction”, like “the Journey to the Center of the Earth” by Jules Verne or the idea of city built in the Earth’s Core – Agartha.
Edmond Halley, the astronomer/geophysicist (1656-1742) talks about an idea of Earth with hollow shell with 800 km thick, two inner concentric shells and an innermost core.

A free-pass to the underworld

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