Fourth Dynasty Pharaoh Snefru's Bent Pyramid was built in the early 3rd Millennium B.C. at Dahshur. The bent pyramid modified the contours of the earlier step pyramid. To make the actually pyramidal shape instead of the stair-step one, the sides of a step pyramid were filled in with stone and covered with lime....Read more.
Egyptian Pyramids
By N.S. Gill, About.com Guide
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