Venice

Venice serves as Marco Polo's homeland, a maritime city-state of familiar canals and family after eighteen years serving in Cathay. He gambles the TARDIS to return there, offering it to Kublai Khan in desperation. Ping-Cho cites it as the farthest reachable point for trade and travel; Susan's home lies beyond, distant as a night star. Guards block paths back; irony sharpens as Polo's bet traps him further from its waters and kin.