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John Palcewski's Journal

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It Began In The Second Millennium BCE

Between the Tigris and Euphrates Rivers Mesopotamian engineers in the second millennium BCE invented the arch, a structure that spans a space while supporting weight. Later ancient Romans perfected the technique. Now arches are everywhere.

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The exterior walls of the Pantheon.
I examined the building closely, and walking all the way around the outside, noticed the strengthening series of arches built into the brick and cement walls, which have long been exposed.

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