- The Ancient Walls: Enigma in the Andes - http://home.earthlink.net/~rnisbet/indexwalls.html
A slideshow of Andean archaeological sites by Richard Nisbet with a focus on Inca architecture and stonecutting. He suggests that the lower structure of Sacsahuaman is much older than c.1508.
- World Mysteries: Sacsayhuaman - http://www.world-mysteries.com/mpl_9.htm
Describes several Inca sites in Peru, with some speculation about alternative dating.
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