The Great Pyramids of Giza appear "stepped" and rugged today because they are missing their original outer casing stones. When first completed around 2500 BCE, the pyramids were covered in highly polished Tura limestone that was so smooth it would have glistened brilliantly white in the sun. Over millennia, these casing stones were systematically removed, primarily for use as a "ready-made" quarry for building projects in medieval Cairo. Following a massive earthquake in 1303 CE, many of the loosened stones were hauled away to build mosques and fortresses. Today, the only significant remains of this casing can be seen at the very peak of the Pyramid of Khafre, which still sports a smooth "cap." Additionally, the pyramids are missing their pyramidions (capstones), which were often gilded in gold or electrum. The loss of these layers has reduced the height of the Great Pyramid by about 8 meters and left the core masonry exposed to the elements, fundamentally changing the monuments' appearance from smooth jewels to the stone giants we see in 2026.