I've done a number of them, but the first one was in 1973.
As I recall, the routing was MLI-ORD-NYC(JFK, I think)-FRA-BEY-DEL-BKK-HKG-SEL(Kimpo)-TYO(Haneda)-ANC-SEA-ORD-MLI. It was leisurely, took four months all in, stopping off for sight-seeing, visits, meetings, and tours.
Long before Frequent Flyer accounts, so no "mileage" figures, and long before airline alliances so lots of carriers, but portions were on the RTW route Pan Am flew in those days.