The Parthenon floor does indeed rise in the middle, but it doesn't follow the curvature of the earth.
The length of the Parthenon is just under 80 meters. The curvature of the Earth over that distance is less than .05mm, but the rise in the Parthenon floor is over 6cm.
Read the transcript at the link I provided for some detail about the curved lines of the Greek masterpiece.

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