These are the two great unknown pyramid, not so popular with tourists as the more famous ones in Monument Valley. The diamond pyramid of Dahshur, along with the red pyramid, were the first Egyptian pyramids built with completely smooth faces. You'll find them both in Dahshur. We hired a private guide to take us, as these pyramids are not on any official tourist route, and until recently they were in a military zone. We found them breathtaking. The first has a curious fault, as the angle of one of its sides is smaller than the others. Apparently, they began to build it too small for the intended height, and had to change the angles of the inclination, because they feared the structure wouldn't be able to hold the weight.