31. 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
32. Cave below Torre Militar Collection: Billie Jean Isbell Andean Collection Set: Zenith sun series Location: Machu Picchu Site (Peru) Date: 1981 Format: Image
33. Machu Picchu Collection: Billie Jean Isbell Andean Collection Set: Zenith sun series Location: Machu Picchu Site (Peru) Date: 1981 Format: Image
34. Machu Picchu, Intihuatana Collection: Billie Jean Isbell Andean Collection Set: Zenith sun series Location: Machu Picchu Site (Peru) Date: 1981 Format: Image
35. 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
36. 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
37. 3 window structure Collection: Billie Jean Isbell Andean Collection Set: Zenith sun series Location: Machu Picchu Site (Peru) Date: 1981 Format: Image
38. Machu Picchu Collection: Billie Jean Isbell Andean Collection Set: Zenith sun series Location: Machu Picchu Site (Peru) Date: 1981 Format: Image
39. Machu Picchu Collection: Billie Jean Isbell Andean Collection Set: Zenith sun series Location: Machu Picchu Site (Peru) Date: 1981 Format: Image
40. Machu Picchu Collection: Billie Jean Isbell Andean Collection Set: Zenith sun series Location: Machu Picchu Site (Peru) Date: 1981 Format: Image