Bent Pyramid of Dahshur
Snefru built two pyramids at Dahshur. His first was designed from the start as a true pyramid. But the 54 degrees angle proved too steep, and as the pyramid was being built on soft, silty clay, there was a problem with stability and subsidence. This was solved by adjusting the pyramid angle to a flatter 43 degrees, 147ft (45m) up the face. The reduced angle brought increased stability, but led to the pyramid's modern name, the Bent Pyramid.
Snefru's second Dahshur pyramid, the Red Pyramid, was a successful true pyramid. It seems that this must have served as the king's eventual resting place.
