Adams’s guilty secret is that he has barely camped, far less mountaineered. But he has a formidable Australian guide, the magnificently crusty John Leivers, and with his help Adams takes us all the way. Through an undiscovered country populated with brilliant and eccentric characters to the enigmatic ruins of Vitcos and Vilcabamba – to arrive at an answer to the question that has nagged scientists since Hiram Bingham’s time.

Just what was Machu Picchu?

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