Machu Picchu was an ancient Incan city located in Peru. The people who lived there were known as Incas, and they were the rulers of the Incan Empire. The Incas were a powerful civilization that flourished in the Andes Mountains from the 12th to the 16th century. The term 'Machu Picchu resident, once' can be used to refer to someone who once lived in Machu Picchu, either as an INCA or as a member of another culture. The crossword solutions for this term are INCA (4 letters) and INCAN (5 letters).