The Millau Bridge, crossing the River Tarn in southern France, is the highest road bridge in the world. It is almost certainly the most beautiful, stunning from every angle. Gwen and I drove across it a few years back and remain amazed by the experience. The French built viewpoints in a number of places for admiring travellers, even including large bus parking areas for tourists visiting the region to see the bridge.
The bridge opened in 2004 and, with approaches, cost $524 million ($609M in 2012 dollars). By comparison, the Port Mann bridge in British Columbia cost $3.3 billion. Yes, there are additional interchange costs here but government hides the details so nobody can excuse the cost differential, other than by pure faith.