Seasons 3, 6 and 9.
TAR 3 - I loved Scotland, Portugal, Germany, Austria, Switzerland and Vietnam but overall the entire route was worthwhile.
TAR 6 - Pretty much everything on this season is worthy of a mention, although Berlin less so and the Hawaii final leg is ughh..
TAR 9 - Although I am not a big fan of the season, the locations were one of the redeeming factors.
I would have included TAR 5 had they actually visited more Europe but to just include Russia for only one leg ain't gonna do it...