Hoover (Boulder) Dam Bypass

On our cross-country trip with the Hayashis a few years ago, we drove on the top of the Hoover Dam, after undergoing a security check, for us and for the car. At that time, we saw the vertical abutments of the new bypass bridge for future traffic.
The construction has progressed slowly, but nicely. The bridge is an amazing engineering feat.

You can see the existing road on the ground and on the dam.