"Don't look down." That's the advice we hear, over and over, if we're even remotely afraid of heights. In theory, if you don't know how far up you are, you won't feel the vertigo swelling in your head ...

Belching clouds of black smoke from Riobamba to Sibambe, the antiquated locomotive hauled our six-car train past snow-capped volcanoes, across wide verdant valleys, and through the rocky corridors of ...