And the Pantheon still has the world’s largest cupola inside. We still don’t understand how to build them that big, despite 2000+ years of studying that sucker.
We know exactly how to build them that big, but choose not to because we have better materials and better techniques. That cupola was created because the builders were too ignorant to figure out a better way to enclose the space, with modern steel it is trivial to create a building that encloses the entirety of the Parthenon.