Frederic Norton wrote in his 1700s era book Travels in Egypt and Nubia of four large pyramids at Giza.
The only problem is that there are currently only three.
It wouldn’t be impossible to cart off a pyramid, but it wouldn’t be easy either. Shouldn’t there be some evidence left? Some suggest Norton was talking about a pyramid further away from Giza, but his map has it very close. I haven’t found much on this “lost” ruin, other than at here. Yeah, I know, it’s a conspiracy site, but it has scans of some of the old maps.
There is undoubtedly much to be found in Egypt, a civilization that lasted for 3000 years. The ancient world has yet to give up all of its mysteries. It may surprise us yet.