Intihuatana at the archaeological site of Machu Picchu is a notable ritual stone associated with the astronomic clock or calendar of the Inca in South America. Machu Picchu was thought to have been built c. 1450 by the Sapa Inca Pachacuti as a country estate. In the late 16th century, the Viceroy Francisco de Toledo and the clergy destroyed those Intihuatana which they could find.