Equally thought-provoking was the appearance of the symbol of the cross on many of these ancient blocks. Recurring again and again, particularly at the northern approach to Puma Punku, this symbol always took the same form: a double crucifix with pure clean lines, perfectly balanced and harmonious, deeply recessed into the hard grey stone. Even according to orthodox historical chronology these crosses were not less than 1500 years old. In other words, they had been carved here, by a people with absolutely no knowledge of Christianity, a full millennium before the arrival of the first Spanish
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