Although in A.D. 1300 the spire of the London Cathedral replaced the Khufu Pyramid of Egypt's Giza Necropolis as the tallest man-made structure, at 481 ft. (147 m) the Great Pyramid of Giza, as the Khufu tomb is famously known, had held the title for 3,800 years. And if that weren't astounding enough, the Giza Necropolis, dating back to the 4th Egyptian dynasty, is the only one of the Seven Wonders of the Ancient World still in existence. Still not enough? A pharaoh's remains are housed in the pyramid to this day. Enough said.