The Great Pyramid of Giza

The Great Pyramid at Giza is an awesome sight, thirty times larger than the Empire State Building(in mass), the Pyramid's features are so large they can be seen from the Moon. The oldest structure in existence, having been started 4,617 years ago, it is the sole remnant of the Seven Wonders of the World.
The Great Pyramid is the most comprehensively studied building in the world. It sited at the northern edge of the Giza plateau. It was estimated that 2,300,000 blocks of stone, weighing between 2-70 tons each, were used in its construction, but recent computer calculations


estimated the total number of slabs to be 590,712. The mortar used is of an unknown origin. It has been analyzed and it's chemical composition is known but even using today techniques it can't be reproduced.
The great pyramid was built during the reign of Khufu (Cheops in Greek), 2nd king of the fourth dynasty ± 2,720-2,560 BC

The Great Pyramid of Giza, also called Khufu's Pyramid or the Pyramid of Khufu, and Pyramid of Cheops, is the oldest and largest of the three pyramids in the Giza Necropolis bordering what is now Cairo, Egypt and is the only remaining member of the Seven Wonders of the Ancient world.