I would love to see this route:
Los Angeles, CA - Salta, Argentina
Salta, Argentina - Buenos Aires, Argentina
Buenos Aires, Argentina - Ascuncion, Paraguay
Ascuncion, Paraguay - Pisa, Italy (did they ever visit the tower of Pisa'?)
Pisa, Italy - Turin, Italy
Turin, Italy - Bled, Slovenia (I've been there, it's absolutely amazing, they could do a Roadblock where one team member has to ride a pletna to the island)
Bled, Slovenia - Harbin, China
Harbin, China - Ulaan Bataar, Mongolia
Ulaan Bataar, Mongolia - Christchurch, New Zealand (my uncle lives here)
Christchurch, New Zealand - Incervargill, New-Zealand
Incervargill, New-Zealand - Quebec-City, Canada
Quebec City, Canada - Boston, USA (they could drive to there)