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Inca Pachacuti  | A 
19th century engraving  | Three 
tiers of walls extend for over 500m  | Cusco 
lies in a valley beyond  | 
   |  |  |  | 
 
 The 
walls are built with massive stones  | The 
stones fit together perfectly  | The 
zigzag walls   | The 
zigzagg walls  | 
   |  |  |  | 
 
 The 
zigzagged walls  | Quechua 
people and llamas   | Stone 
stairways lead between the levels  | Sacsayhuaman 
fortress overlooks Cuzco  | 
   |  
 |  |  | 
 
 The 
'throne' of the Inca  | The 
'throne' of the Inca  | Stormclouds 
over Sacsayhuaman  | The 
walls are immense and face away from Cuzco  | 
  
 |  |  |  | 
 
 Visitors 
can reach the three levels  | Muyu-marca 
circular stone walls.  | Muyu-marca 
circular stone walls.  | Muyu-marca 
circular stone walls.  | 
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 |  |  |  | 
 
 | The 
sun sets behind a stone gateway |   |   |   | 
 
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