Ariane and Nino are in Egypt—ancient Egypt. That's about 4,500 years ago, when the world's largest pyramid was built. It's called the Pyramid of Cheops because it was built for the Pharaoh Cheops, who wanted to be buried in it when he died. That's right: pyramids are giant tombs! It was the first of seven buildings known as The Wonders of the World—and it's the only one still standing! As you can imagine, it's had a pretty eventful time over the last 45 centuries, but it still has plenty of secrets waiting to be uncovered ...