In Colossus, Michael Hiltzik talks about the way Hoover Dam, during its construction, became a tourist spectacle.
When Lissa and I were in Boulder City last week, I found this in the museum-y hallway at the Boulder Dam Brewing Company (which has a lovely collection of similar memorabilia), a poster hawking tours:
THE MAKING OF AMERICA! Power for the coming centuries! Blocking the age-long escape of floods to the sea! The massive Hoover Dam will create the largest artificial lake in the World. Never again will humanity view the open gorge of the Black Canyon, nor the river basin above it. See it now. Have your children see it.