Dona Maria Pia Bridge by Gustav Eiffel 1877, was once longest iron arch in world, Douro River, Oporto, Portugal

- Image ID: F9F7BG
Dona Maria Pia Bridge by Gustav Eiffel 1877, was once longest iron arch in world, Douro River, Oporto, Portugal
Philip Scalia / Alamy Stock Photo
Image ID: F9F7BG
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