Holiday World says it will spend $4.5 million to build all that. Across the country, amusement parks dole out millions of dollars every year just to keep people coming back. But that doesn't always work. Holiday World is the exception. It is doing phenomenally well compared with the industry as a whole. From 1990 to 2005, attendance at Holiday World jumped 161 percent, while attendance at U.S. amusement parks overall rose 32 percent.
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