Did Marco Polo really reach China or invent history's greatest travel lie? In 1271 the 17-year-old Venetian vanished for 24 years, served Kublai Khan for 17 and claimed to govern Yangzhou on the Grand Canal. Europe mocked his tales of mulberry paper money, burning black stones and a 200-mile-a-day Yam post — in 1995 Frances Wood argued he never went. The film weighs what he got right, the rubies sewn in coats and the Genoa prison book Columbus covered in 600 notes.