Premise: Machu Picchu ( [ ˈmatʃu ˈpitʃu ] ) ( Machu Pikchu [ ˈmɑtʃu ˈpixtʃu ] ) is a 15th-century Inca citadel situated on a mountain ridge 2430 m above sea level .
Hypothesis: Machu Picchu isn't a citadel.
Label: CONTRADICTION