Bent Pyramid of Snefru
2613 BC - 2589 BC
The unique bend in this, the southernmost and earlier of Snefru's two pyramids at Dahshur, is thought to reflect engineering difficulies with the pyramid's foundation and masonry. Because of these problems, the pyramid was finished off at a gentler slope (43°) than its initial 54°. This change made the Bent Pyramid more stable, by reducing its final height and weight. (Compare: Snefru's Red Pyramid.)
Unlike most pyramids in Egypt, the Bent Pyramid has a great deal of its outer "skin" still remaining, The Bent Pyramid is unique in having two entrances: the usual north entrance, plus an additional entrance on the west face.
The Bent Pyramid's northeast corner is shown in this photo.