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Machu Picchu is an ancient city, located in the mountains of Peru, that once belonged to the Incan civilization as a residence for the empire's emperor. The city is located on top of a mountain, making it difficult to access. Machu Picchu was rediscovered by Tomas explorers, who hid the Clue Cocoa in the city.
Grace Cahill may have visited the city while hunting for Clues, as Card 240: Machu Picchu depicts her cat, Saladin, in Machu Picchu. Ekaterina agent Alistair Oh also visited Machu Picchu, though it is unknown if he found the Clue hidden there.