Two hours after setting off from the wonderful Titilaka (read about it here), our very comfortable base on the shores of the Peruvian side of Lake Titicaca, we were at the border.  Here, all that separated Peru from Bolivia was an archway and after a few stamps in our passports from surly looking men, we were in.  Immediately the feeling was like we’d stepped back in time as a local peanut seller set up her stall next to me on the roadside.