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The Inca Empire encompassed mountains, forests, desert, and coastal plains. In order to move armies and people quickly and efficiently around this landscape, the Inca needed roads. They developed an incredible network which stretched for 40,000 kilometres, from modern-day Ecuador to Argentina. When the landscape proved too inhospitable for stone, they used straw, constructing beautiful bridges like the Keshwa Chaca bridge – which is still in use today.