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Filip Coppens has kept up the prolific rate of addition to his website with another essay (originally published in Frontier Magazine), this one titled “Viracocha’s Voyage“:

Macchu Picchu, Nazca, Tiahuanaco… Though the major monuments of Peru are mapped and known – though the jungle continues to surrender some of its secrets even today – so far these spell-binding monuments have largely been looked upon in isolation, without trying to interlock the various monuments with each other – let alone possible interoperability.

If you haven’t visited Filip’s website before, there is plenty of interest there – start at the beginning and work your way forward.