Wonders of the Old Kingdom
I was just at an Apple Learning event and explored the "Pyramids" app. This would make a great virtual "field trip" for a class. Even if you can't afford a copy for a class set, use a projector with a single download and explore as a class!
"The greatest monuments of ancient Egypt are brought to life on the iPad screen in this immersive, navigable 3D world. Uncover the fascinating story of history's greatest treasures by exploring Egypt's famous pyramids and tombs within an interactive view of the Giza plateau."