The Great Pyramid of Cholula is the largest pyramid in the world by volume, but for centuries, it went unnoticed, hidden in ...

"The Great Pyramid at Giza is known to have an amazing character of concavity that each of its four faces is slightly ...

The Great Pyramid in Egypt is 800 feet in height, and its base occupies thirteen acres Its weight is estimated at six millions of tons and its erection would occupy 3,000 men twenty years.

Standing at the base of the Great Pyramid, it is hard to imagine that this monument—which remained the tallest building in the world until early in this century—was built in just under 30 years.