Boulder Dam Becomes Top Rank Tourist Attraction -- Regular commercial airplane service affords to visitors a chance to see Boulder Dam and Lake Mead from aloft, with streams of water flowing from the canyon wall at a height greater than Niagara Falls. Aerial trips are available. Not over the immediate dam area and Grand Canyon but also to Bryce Canyon and Zion National Parks. Tourists and sight-seers are visiting the $165,000,000 Boulder Dam Spectacle at an average of well over 1,000 persons a day as this greatest power project in the world is rapidly taking a high rank among tourist attractions of the West. November 25, 1936. (Photo by Wide World).