The Great Pyramid of Giza is the biggest Egyptian pyramid and the tomb of Fourth Dynasty pharaoh Khufu. Built in the early 26th century BC during a period of around 27 years, the pyramid is the oldest of the Seven Wonders of the Ancient World, and the only one to remain largely intact. As part of the Giza pyramid complex, it borders present-day Giza in Greater Cairo, Egypt.
Initially standing at 146.6 metres (481 feet), the Great Pyramid was the tallest man-made structure in the world for more than 3,800 years.
The Burg Kalifa at 828 meters tall. That’s 2,717 feet high which is 5.6 times higher than the Great Pyramid. 
The World Trade Center was 1,362 feet high, about half as high as Burg Kalifa and three (3) times taller than The Great Pyramid.
One World Trade Center which was built on the spot where the Twin Towers were destroyed by Middle Eastern Terrorists is 1,776 feet high which is still one thousand feet lower than Burg Kalifa.
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