There has been much speculation about the Incan empire, especially about how some of their stone structures were built.  This video examines some of the secrets:

Discover the gems of the 15th Century Incan empire, a domain which covered much of South America. The splendid cities of Curzo and Chairana and the grandeur of Machu Picchu captivated the imagination and, unfortunately, greed of the Spanish conquistadors. Lifelike virtual construction gives us a close look at the massive sacred grounds of the Temple of the Sun at Cuzco, religious and political capital of a world known to generations of European adventurers as El Dorado.

Let’s uncover some of the Incan mysteries in the video on page 2

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