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According to an article published in The Arizona Gazette on April 5, 1909, the Grand Canyon was once home to a civilization that most likely consisted of individuals of cyclopean proportions. If such a civilization ever lived, surely it would have left behind some structure as a testament of its existence.
The article mentions the discovery of an enormous underground citadel by an explorer named G.E. Kinkaid, who stumbled upon it while rafting on the Colorado River.