University of Cambridge

Machu Picchu and Cusco in Peru: mechanical keying of rocks


The Inca people in Peru mastered the art of mechanically keying large granite rocks to form impressive buildings that are resistant to earthquakes like the 7.7 Richter one that struck in 1950.

More pictures of Machu Picchu




Machu Picchu, Harry Bhadeshia, Patricio Mendez, Alberto Bajarano, Peru
There are many locations in Cusco where the original Inca constructions survive. Only mechanical keying held these huge granite stones together.
Machu Picchu, Harry Bhadeshia, Patricio Mendez, Alberto Bajarano, Peru
Cusco is a major tourist attraction and the local people are friendly and helpful.
Machu Picchu, Harry Bhadeshia, Patricio Mendez, Alberto Bajarano, Cusco, Peru
Notice the way in which the stones are placed, with careful mechanical keying.
Machu Picchu, Harry Bhadeshia, Patricio Mendez, Alberto Bajarano, Cusco, Inca, granite, Peru
There are some small protrusions on the stones which are configured to interact with sunlight. The Inca worshipped the sun.
Machu Picchu, Harry Bhadeshia, Patricio Mendez, Alberto Bajarano, Peru
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Machu Picchu, Harry Bhadeshia, Patricio Mendez, Alberto Bajarano, Peru
Notice the sophisticated mechanical keying which made these structures earthquake resistant.
Machu Picchu, Harry Bhadeshia, Patricio Mendez, Alberto Bajarano, Peru
Notice the sophisticated mechanical keying which made these structures earthquake resistant.
Machu Picchu, Harry Bhadeshia, Patricio Mendez, Alberto Bajarano, Peru
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Machu Picchu, Harry Bhadeshia, Patricio Mendez, Alberto Bajarano, Peru
Mechanical keying held the structures together without anything cementatious between the stones.
Machu Picchu, Harry Bhadeshia, Patricio Mendez, Alberto Bajarano, Peru
This is the Sun Temple.
Machu Picchu, Harry Bhadeshia, Patricio Mendez, Alberto Bajarano, Peru
The steps indicate the past, present and the future.
Machu Picchu, Harry Bhadeshia, Patricio Mendez, Alberto Bajarano, Peru
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Machu Picchu, Harry Bhadeshia, Patricio Mendez, Alberto Bajarano, Peru
Amazing workmanship.
Machu Picchu, Harry Bhadeshia, Patricio Mendez, Alberto Bajarano, Chinchilla, Peru
Chinchillas are rodents that are native to the Andes Mountains in South America. They live in colonies and are found at high elevations
Machu Picchu, Harry Bhadeshia, Patricio Mendez, Alberto Bajarano, Chinchilla, Peru
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Machu Picchu, Harry Bhadeshia, Patricio Mendez, Alberto Bajarano, Peru
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Machu Picchu, Harry Bhadeshia, Patricio Mendez, Alberto Bajarano, Peru
Chinchillas
Machu Picchu, Harry Bhadeshia, Patricio Mendez, Alberto Bajarano, Peru
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