Taking the train or bus in sounds like a fab visual treat. I can take one One World flight (2 sectors - there and back - on my xONEx) from Buenos Aires and would love to go to Cuzco. I was assuming I would fly to Lima and then buy a return to Cuzco from there but if I can have a 12-ish hour bus or train journey with great views by going elsewhere I'd love that. Any advice?