Engineering Marvel Beneath Orvieto
3:57–4:27 · 29s
Andrea explains the ingenious dual-spiral design of Orvieto’s 500-year-old St. Patrick’s Well—two stairways that never intersect so mule teams could descend and ascend without collision.
3:57–4:27 · 29s
Andrea explains the ingenious dual-spiral design of Orvieto’s 500-year-old St. Patrick’s Well—two stairways that never intersect so mule teams could descend and ascend without collision.
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