How did Polo reach Peking in The Travels of Marco Polo?

had
been spending time with Kublai Khan at his famous pleasure palace in the great city of Xanadu
(modern-day Shangdu). The two men got along famouslyso much so that Kublai Khan trusted Polo to
be his special envoy on diplomatic missions to neighboring countries. The Italian explorer even
claimed that Kublai Khan appointed him as governor of Yangzhou, though...