Just a year ago I was on a plane on my way to my excellent South American adventure. That's the view as we neared the crest of a 4200 meter pass in Peru, and the bus that took me from Cuzco to Puerto Maldonado. The road we were traveling was the Estrada do Pacifico. Following it (which has more than one name along its length,) you can go from the Atlantic to the Pacific over the Andes and into the Amazon basin.
Right now I'm a little more than half way through a first draft of the book that I was researching on the trip, Road through Time. The next chapter will talk about the Inca road as well as the very bad roads that existed in the 16th and 17th century in Europe. I've got a ways to go before I make it to the present!