The Millau Viaduct is a work of both engineering prowess and architectural grace. Spanning the River Tam, in the south of France, Millau is a massive piece of infrastructure that appears as light as the fog that puffs across the valley.When it opened on 17 December 2004, the spectacular Millau Viaduct set new standards in both planning design and construction - without mentioning the record it set as the largest cable-stayed bridge in Europe. Near the bridge is a permanent visitors’centre with stunning views of the bridge and across the valley which it spans.At 2.4km long, and 270m above the river at its highest point, the Millau viaduct spans a 2km valley in the Massif Central mountain range and forms the final link in the A75 highway from Paris to Barcelona.