Check this 5 minute video clip titled "25 Incredible Things about the Incas that Will Astonish You".
Check this 11 minute clip titled "Rise of the Inca Empire".
Check this 49 minute clip titled "The Secrets of the Incas".
Check this 51 minute clip titled "Unexplained Mysteries of Machu Picchu".
We are on the unit about the Americas which is Chapters 11 and 12.
To see the Internet version of Chapter 12, lessons 1 and 2, click on the icon to the left to take you to that web site.