A viaduct is a long bridge that carries a road or railway over a valley, river, or other obstacles. It typically consists of a series of arches or spans supported by piers. Viaducts are designed to provide a smooth and efficient route for transportation, allowing vehicles and trains to cross difficult terrain without interruption. One of the most famous examples of a viaduct is the Millau Viaduct in France, which is one of the tallest bridges in the world. Viaducts are important in civil engineering, as they help connect communities and improve infrastructure by overcoming geographical challenges.