The Old Kingdom pharaoh, Khufu, is responsible for one of Egypt's most famous monuments ... the pyramid remained the tallest structure in the world; it was only surpassed by Lincoln Cathedral ...

A 30-foot-long hidden corridor was discovered by scientists Thursday near the main entrance of the 4,500-year-old Great Pyramid of Giza in Egypt ... meters and was the tallest structure made ...

The pyramid is thought to be the oldest in Egypt, with its construction ... making it the tallest man-made structure in the world at the time, as far as we know. But exactly how the pyramid ...