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The pyramids are essentially just piles of rocks. The impressive part about them is not really how they stood out the test of time, in fact they lost most of their finer details, but how an ancient civilization managed to make piles of rocks that big.

The Pantheon is not a pile of rocks, it is made of engineered materials (concrete), with domes and overhangs. Unlike "pile of rocks" architecture that essentially can't fail, if it wasn't well engineered, it would have collapsed into something unrecognizable.

stone != concrete

edit: we have a > 2,000 years old pyramid in Rome too, and it's in perfect shape, because stone != concrete

https://upload.wikimedia.org/wikipedia/commons/thumb/9/9d/Ci...

What it is: https://en.m.wikipedia.org/wiki/Pyramid_of_Cestius

Funny, its perimeter vs. height approximates pi, rather than the originals' 2pi.

Hehe, that's funny. But the OP clearly meant it relative to other stuff built 2000 years ago, most of which has vanished without leaving a trace, maybe a couple of foundation stones buried under a meter of new topsoil.

Have an upvote, it's sad to see you grayed out.