Khufu’s Great Pyramid, Giza

It’s 230 meters (756 feet) long on each side, 137 meters (450 feet) high and is composed of 2,300,000 blocks of stone, each averaging 2 1/2 tons in weight. Despite the makers’ limited surveying tools, no side is more than 8 inches different in length than another, and the whole structure is perfectly oriented to the points of the compass. Even in the 19th century, it was the tallest building in the world and, at the age of 4,500 years, it is the only one of the famous “Seven Wonders of the Ancient World” that still stands. Even today it remains the most massive building on Earth. It is the Great Pyramid of Khufu, at Giza, Egypt.

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