Today’s Friday Photo is of the Bent Pyramid, part of the Dahshur funerary complex that is located around 40 km south of central Cairo.
During the Old Kingdom, when Memphis was the ancient Egyptian capital, pretty much the whole of the west bank of the Nile was a necropolis. Dahshur is the southernmost site, with Saqqara and then the Giza Plateau further north.
The Bent Pyramid is believed to be the fifth pyramid built in Egypt, and was the second built by Sneferu (father of Khufu, builder of the Great Pyramid). You can see that the angle of the sides changes about half way up, from 55 to 43 degrees (hence the name). The most common explanation for this is that the pyramid was showing signs of instability, so the workers changed to a shallower angle to avoid having it collapse.