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 th

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.