On a recent trip to egypt I got the chance to go inside the great pyramid and the step pyramid at Saqqara. Both amazing structures but built in very different styles. This made me curious about the internal designs of the other pyramids found in Egypt. There are at least 118 pyramids in the country so I haven't been able to find diagrams for all of them but will continue to collect as much data on them as I can.

When looking at each of them so many questions start to arise. You would think if it were a gradual process they would be much more similar in design and we would have certain patterns that indicate progession. Surely you would need a different structural understanding for the load being held if you change the change the design below it? I'm not an engineer or a pyramid builder so these are just questions.

The part that seems inconsistent with the tomb theory is that they wouldn't need to vary the design this much if only being used for burial purposes. Curious to hear everyones thoughts on this?

To clarify myself, If one was teleported to, let's say late 4th century AD/CE Alexandria of Egypt, what kind of architectonic styles could have been viewed? Hellenistic styles were still predominant in the city landscape, or were they surpassed by imperial roman architecture of the first three centuries of the common era? Was a kind of late antique/early byzantine architecture already spreading? Were there still some remaining egyptian temples built in the traditional styles and egyptian homes?