You spend years marching across Siberia and finally happen upon your next clue carved into ice. It reads: "The trade winds are blowing. You'll find it on this road." What was the most important trade network of roads at the time of the Mongols?

The Silk Road is an ancient trade route connecting China with Rome. The 4,000-mile road had fallen into disrepair until the Mongols came along and revived it during the 13th and 14th centuries. In fact, it's what famous explorer Marco Polo traveled to get to China around that time.

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