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Which ancient bridge in Isfahan has foundations dating from the Sasanian era?

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Isfahan, Iran: Masjed-e Emām (“Imam Mosque”) — Isfahan Masjed-e Emām (“Imam Mosque”), Isfahan, Iran.

The ancient bridge in Isfahan with foundations dating from the Sasanian era is the Shahrestan Bridge.

While the bridge spans the Zayandeh River, only its original piers remain from the Sasanian period, as the upper sections of the structure have been rebuilt multiple times throughout history.1