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Lost Civilizations

1 documented theory filed under this subject.

Agartha, the Kingdom Under the WorldA hidden subterranean civilisation with its own pontiff, its own language and, in some tellings, hundreds of millions of inhabitants waiting to surface. It is usually presented as an ancient Eastern tradition. Its paper trail begins in a French book of 1873 and can be followed forward almost year by year.Updated Sep 24, 2026