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The Great Pyramid is one of the largest buildings ever constructed. It originally stood about 482 feet (147 meters) tall, but erosion and the removal of most of the polished limestone casing stones—which made the structure smooth and caused it to gleam in the sunlight—have lowered the pyramid’s height to 449 feet (137 meters). The base and three sides each measure 755 feet (230 meters) in length. The pyramid’s sides rise at an angle of 51.87° and are accurately oriented to the four cardinal points of the compass. The Great Pyramid’s core is made of yellowish limestone blocks, and the inner passages are of finer light-colored limestone. The interior burial chamber is built of huge blocks of granite. Approximately 2.3 million blocks of stone were cut, transported, and assembled to create the 5.75-million-ton structure, which is a masterpiece of technical skill and engineering ability. The internal walls, as well as those few outer-casing stones that still remain in place, show finer joints than any other masonry constructed in ancient Egypt.