hi! yes, it has been asked a few times. Looks like the matter is in some dispute :)

• Why is it believed that Marco Polo may have never seen China? <- here's your chopsticks mention

• Did Marco Polo actually go to China?

• There's an episode of ST:TNG where Picard tells Wesley that before Marco Polo most people in Europe didn't know whether or not China really existed. That's not true ....right?

• What do you think about the theory that Marco Polo didn't go to china?

• How much do we know about Marco Polo's journeys?