Flew back to Cusco which is 2 miles above sea level. Have been told to expect altitude sickness which is dizziness, numbness, nausia and a headache but seem to be OK so far. Cuzco is a lovely city. They were setting off bangers in the street for some unknown reason and they were so loud I could feel the sound on my back as I turned away! Apparently to avoid altitude sickness you are supposed to eat only a little (because eating diverts blood to your tummy when it is needed for your lungs). Did not stop me having to giant sandwiches which I may live to regret. I am short of breath though - I can't walk and talk at the same time without panting.
Saw some Inca ruins at 3800M called Saqsaywaman (prounounced "sexy woman" ;) ). It was built as a fort and decisive battles with the Spanish conquestadors took place their. 200 Spanish were able to defeat all of the Incas because they had guns, armour and horses. The stone work is amazing - each stone fits EXACTLY with the others with no morter (you could not find a space to fit a hair in between the massive stones).