We waited around for an hour or so, hoping that the fog would lift and we would be rewarded with the magical view of Machu Picchu we'd been dreaming about, but alas, it was not to be.
I had never heard of Arequipa until I looked at a map of Peru, but apparently a lot of travelers stop here en-route to Cuzco or Puno, in an attempt to acclimatize more gradually to the high altitudes.
Travelling by long-distance bus in Peru turned out to be a dream - especially on Cruz del Sur.