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In India, Marco Polo noticed how intelligent and smart the people were, and had a lot of beliefs religion-wise. It was a good milestone for both Marco Polo and Denis/Francis. Back when Marco traveled, there could be many things that could go very wrong, but once Denis and Francis followed his routes, they realized that the places he visited changed drastically, through the amount of destructiveness, barbarism, ruthlessness, etc. Not very problematic.

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Jerusalem, Turkey, and Iran were all similar time-wise, but when it came to certain situations, it was problematic towards Marco Polo from when he was alive.
Persia, Afghanistan, and Balkh had little to no problems for Denis&Francis and Marco Polo.
China:Kashgar/Taklamakan desert was fine for Denis and Francis, but for Marco Polo it was something he would never forget, for he heard "spirits" speaking to him. In Mongolia, the people were very generous and weren't wasteful whatsoever. The rest of china was very pleasing as well.

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Denis and Francis followed Marco's routes, and while doing this they realized how difficult or how much Marco went through to get to where he ended at. Marco had many ups and downs when he traveled, but when Denis and Francis followed his footsteps, it wasn't as bad for them as it was for Marco. Back then there were many things that could go wrong, but in today's society, it wasn't that bad.

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Marco Polo had to go through some challenging areas, and because of this, not many people of the era thought to follow in his footsteps. It would be very interesting if someone were to today, and it would be pretty different. The areas he traveled would probably be a little more difficult to get to.

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His book was not immediately able to "brainwash" people into exploring the unknown, but over time, it grew on people.

His book made peoples’ curiosities grow upon them, and eventually they became more interested.

Once people were interested in his book, it changed their lifestyles, and they looked up to him.