It doesn't matter how many times you see the Great Pyramid, it's always astounding. The tomb of Pharaoh Khufu is pure perfection. It's not just a huge pile of rocks neatly placed on top of each other. It was made 2,000 years before Pythagoras came up with his triangle theorem.

It is a really complex building designed with very simple tools: the naked eye and a piece of string with a weight on the end (a plumb bob). They lined it up to the stars to create one of the most accurate buildings of all time. 45 centuries later, it is still more precise than many modern skyscrapers.

Archaeologist John Romer discovered survey points right next to the Great Pyramid. He found a 1-to-1 plan of the pyramid mapped out on the Giza Plateau. The plan of the pyramid is the same size as the finished thing! By measuring out the life-size plan with string, the Egyptians were able to get their ancient calculations perfect.

He believes he found yet another plan for the inside of the pyramid. The difference between the two grids gives the pyramid its magical angles.

Inside, the tunnels are narrow because they weren't built for access, but as control lines for the builders. Entering the biggest space, the Grand Gallery, you see the "masterpiece" of the whole pyramid.

In King Khufu's burial chamber, there is nothing. It's completely plain. There are no ornate hieroglyphs. When he died, it was filled with luxuries and gold furniture, but today, the only surviving statue of King Khufu—the man who built a Wonder of the World—is a tiny, 3-inch statue in the Cairo Museum.

Down at the limestone quarry, the ancient workers left their mark. How did they move the stones? Half a dozen men and a lot of water. If you stick a stone on mud and add water, it slides like ice.

Were they slaves? Romer believes they were passionate, willing craftsmen. There were 25,000 men building the pyramid. On average, the 2 million stones each weigh 2.5 tons. They laid two stones every 3 minutes, keeping up a frantic pace for 14 years!