name that miniseries

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I remember a miniseries in the early to mid 1980s (about 6 hours in length) on tv about a father and son who travel to China after hearing about Marco Polo's adventures. They set out across Asia from Europe by land. Along the way they met two other people, a young woman with whom the son falls in love, and a bad guy, who join their group but are later separated. The father and son make it to China and the girl and bad guy arrive later. If I recall it was called "The Secret of the Black Dragon" but my searches on the web have turned up nothing. Can anyone gelp me find it?