Related articles:
Agartha
Conspiracy theory
Earth
Edgar Rice Burroughs
Martin Gardner
Mount Shasta
Outer core
Thule Society
Vril
Weightlessness
Key terms:
abdelkader
adolf hitler
agartha
antarctica
burroughs
cavern
center of the earth
concave hollow earth
concentric
currey
dyson sphere
earth expedition
edgar allan poe
expedition
gardner
gravity
halley
hollow earth
hollow earth hypothesis
hollow earth theory
hollow shell
hypothesis
idea of a hollow earth
inhabited
inner
inner earth
inner surface
inside the earth
interior
interior of the earth
journey
journey to the center
leonhard euler
martin gardner
mcbride
north pole
openings
pole
populated
reynolds
s interior
science fiction
shaver
shell
spherical
subterranean
symmes
teed
ufos
used the idea
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