21. Torre Militar and cave Collection: Billie Jean Isbell Andean Collection Set: Zenith sun series Location: Machu Picchu Site (Peru) Torreon (Machu Picchu Site, Peru) Date: 1981 Format: Image
22. Cave below Torre Militar Collection: Billie Jean Isbell Andean Collection Set: Zenith sun series Location: Machu Picchu Site (Peru) Date: 1981 Format: Image
23. Machu Picchu Collection: Billie Jean Isbell Andean Collection Set: Zenith sun series Location: Machu Picchu Site (Peru) Date: 1981 Format: Image
24. Machu Picchu, Intihuatana Collection: Billie Jean Isbell Andean Collection Set: Zenith sun series Location: Machu Picchu Site (Peru) Date: 1981 Format: Image
25. Machu Picchu, Torre Militar Collection: Billie Jean Isbell Andean Collection Set: Zenith sun series Location: Machu Picchu Site (Peru) Torreon (Machu Picchu Site, Peru) Date: 1981 Format: Image
26. Machu Picchu Collection: Billie Jean Isbell Andean Collection Set: Zenith sun series Location: Machu Picchu Site (Peru) Torreon (Machu Picchu Site, Peru) Date: 1981 Format: Image
27. 3 window structure Collection: Billie Jean Isbell Andean Collection Set: Zenith sun series Location: Machu Picchu Site (Peru) Date: 1981 Format: Image
28. Machu Picchu Collection: Billie Jean Isbell Andean Collection Set: Zenith sun series Location: Machu Picchu Site (Peru) Date: 1981 Format: Image
29. Machu Picchu Collection: Billie Jean Isbell Andean Collection Set: Zenith sun series Location: Machu Picchu Site (Peru) Date: 1981 Format: Image
30. Machu Picchu Collection: Billie Jean Isbell Andean Collection Set: Zenith sun series Location: Machu Picchu Site (Peru) Date: 1981 Format: Image