The pyramids at Giza in Egypt, are among the most famous pieces of architecture in the world. The Pyramid of Khafre was built as the final resting place of the pharaoh Khafre in about 2530 BC. This pyramid, about 136 m (446 ft) high, was built without the use of cranes, pulleys, or lifting tackle. Archaeologists are still not certain how this was accomplished. Remains of the original limestone casing are visible at the top of the pyramid