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Those arches add something to the looks, and I assume provide some structural support to the opening?

Yes support. And good looks ! This ones a little different than the ones i see around here.

Some really ancient ones are pretty tricky with that top curve and the "keystone" in the arch. :)

Pretty amazing skills to quarry that stone from the earth and know how to make use of it!

We need those Inca stonemasons to build some things around here : )