Located at the royal necropolis of Dahshur, about 25 miles south of Cairo, the Bent Pyramid, so named because of its sloping upper half, was built under the Old Kingdom Pharaoh Sneferu (about 2600 BC). It's the first with smooth faces after generations of stepped pyramids.
The monument has two entrances, one on the north side and one on the west side. These entries open on two corridors leading to two burial chambers arranged one above the other.
It was speculated that pharaoh Sneferu rests inside the pyramid in an undiscovered burial chamber, but innovative scanning technology ruled out the hypothesis as it did not detect any additional chamber of the size of the upper chamber or beyond.
Pyramid Interior Revealed Using Cosmic Rays