Every time I hear an argument "The Egyptian pyramids are still standing to this day", I'm taken aback. Like, what can a pyramid even crumble into, a pile of stones? It already is a pile of stones! Literally!

Some of the earlier pyramids did crumble. They made mistakes and learned from them and innovated over time. The pyramids aren't still standing (just) because of the materials, there's real structural engineering at work.

Erosion.