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Hello,
Not sure about the pyramids, they were buried for a long period of time, they are eroding quickly with exposure to air and now airborne chemicals.
So, I'd start with any cities and structures the wrong side of encroaching sand dunes etc. If they can get buried and not have too much ground water, erosion and chemical wear are reduced.
I'd go a few of the geo-stationary satellites, 1000 years isn't long enough to see them all atomised by space.
Large ground disturbances like open cut mining...
On the other hand:
Assuming the aliens have ground penetrating radar better than we have just started to advance ourselves. Much of human history will be there to read as images, to what level depends on the technology of the ground penetrating and the fragment recovery/analysis process.
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