Input (grade 11): Indoor waterparks in Wisconsin Dells debuted in 1994 after the Polynesian Resort Hotel built the first one in the U.S..
Output (grade 9): Indoor waterparks in Wisconsin Dells started in 1994 after the Polynesian Resort Hotel built the first one in the U.S. Mt. Olympus Theme and Water Park (formerly Family Land) is another huge water park in The Dells.