The Si-o-se-pol, the bridge of thirty-three arches, is Isfahans most famous bridge, an elegant Safavid-era span across the Zayandeh River with two tiers of arcades. A beloved gathering place, especially at sunset and after dark when it is beautifully lit, it is a masterpiece of Persian engineering and one of the citys most romantic and photographed landmarks, alive with strolling locals.