Don’t all units on Ancient Egypt at least mention the pyramids and mummies? This 
site will fit right in. The Oriental Institute of the University of Chicago has a great simulation site that explores the process the ancient Egyptians used to mummify a person. With the opportunity to click on new vocabulary words, the simulation takes visitors through the seven step process of mummification.
The Oriental Institute also has a great Teacher Resource Center with lesson plans and information geared toward the middle and high school levels.
No Time to Sleep 