There were folks in the 1800s who also doubted the existence of Admiral He and the Treasure Fleet.
They were professional doubters who made money off the dime press questioning just everything ~ they even questioned every detail of the Bible. Then, one day, someone discovered cunuiform wedge filled fired clay tablets and Sumer was uncovered! The Brits figured out who Admiral He was. Polo's works were popularized and doubters were simply kicked aside.
It's hard to believe there continue to be folks who doubt Polo!
Marco!