Was planning on driving to the dam itself but traffic was backed up all the way to Boulder City so decided to settle for visiting the museum. No regrets! Learning about the history of the dam, the politics, the engineering, the physical construction, the pay of the workers in their various jobs, and the awful working conditions really made me appreciate the dam far more than a live glimpse (which I swear I'll do every time I go to Vegas, but something always comes up).
The museum itself is located on the ground floor in the back of a hotel. Displays aren't particularly fancy but the admission fee is only a couple of dollars. There is a 20 minute film that is definitely worth watching.
Seeing the dam and going through their tour is next on my list but I'm glad to have learned about all of the facets of the history of the dam before getting lost in the enormity of the structure itself.