Citadels of Mystery

L. Sprague de Camp, Catherine Crook de Camp

Non-fiction

Citadels of Mystery is also known as Ancient Ruins and Archaeology.

The past yields its secrets reluctantly; blues to the ways ancient knowledge are found in the ruins of twelve civilizations, including an exploration of theories of space invaders, created earth or man, and Atlantis.

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Published
1964
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Author

L. Sprague de Camp

Lyon Sprague de Camp (1907–2000) was an American science fiction and fantasy author. His writing career spanned over fifty years. He wrote novels and works of nonfiction.