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I used to think it would be interesting to "shadow" a Roman Empire engineer to see how they built road, bridges, buildings, aqueducts, etc. After seeing the stunning photos of Machu Picchu, Choquequirao, Vitcos and Espiritu Pampa, in Peter Frost's seminar, I now think Inca engineers are the ones I want to "shadow" because what they built in such rugged terrain is phenomenal. Mr. Frost gives an insightful talk about the Inca cities built in the Vilcabamba valley. This seminar makes a future trip to Peru more meaningful.