From 100 Facts For 100 Years of Machu Picchu - #55

By Catharine Hamm | Los Angeles Times Travel Editor

55. No one is certain exactly when Machu Picchu was built, but best guesses suggest it was some time around the mid-15th century.

Unlike many of the Inca Sites which were built by other cultures and modified by the Incas.  Archealogists believe the Incas built Machu Picchu.