The Trans-Iranian Railway, a UNESCO World Heritage site in Iran, recognized in 2021, is a historic rail network completed in 1938 under Reza Shah, linking the Persian Gulf to the Caspian Sea. Spanning diverse terrains—mountains, deserts, and valleys—it features over 174 bridges, 186 tunnels, and bold engineering feats like the Three Golden Lines spiral. Built to boost trade and modernization, this 20th-century marvel reflects Iran’s industrial ambition and technical prowess, connecting remote regions while integrating local and international design influences.

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