There are several day trips available from Las Vegas. The grandest of them all is of course the Grand Canyon. However, in order to see it properly you will either have to rent a helicopter from Vegas or stay overnight closer to the canyon. As Las Vegas was just a side step on our trip to LA, we wanted to give Grand Canyon the time it deserves, sometime later. So it was either Death Valley or the Hoover Dam. I remember when I had a summer job in the US, some of my fellow summer workers got a job in Death Valley while I lived and worked in the Boston area. Even Boston was hot enough during the summer. Hoover Dam was closer so we drove there.
To our surprise there were two things there which were amazing: the dam itself as well as the bridge. In the movies you usually see people driving across the dam itself but actually the highway doesn\’t run on top of the dam but there is a huge bridge next to the dam. Mike O\’Callaghan–Pat Tillman Memorial Bridge clearance is 270 m. So you could almost fit the Eiffel Tower between the bridge and the Lake Mead.