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Machu Picchu [a] is a 15th-century Inca citadel located in the Eastern Cordillera of southern Peru on a mountain ridge at 2,430 meters (7,970 ft). [9] Often referred to as the "Lost City of the Incas", [10] it is the most familiar icon of the Inca Empire.
The Babylonian clay tablet YBC 7289 (c. 1800 –1600 BC) gives an approximation of √ 2 in four sexagesimal figures, 1 24 51 10, which is accurate to about six decimal digits, [29] and is the closest possible three-place sexagesimal representation of √ 2: