With 156 acres of adventure, welcome to the heavenly Wisconsin Dells water and theme park. Mount Olympus offers an indoor and outdoor waterparks, the Parthenon Indoor Theme Park. Lose yourself in an ancient world as you brave four thrilling lands. Thirty-seven steep and slippery slides. Six hair-raising roller coasters. Eight curve-hugging go-kart tracks. A titanic array of attractions, wet and dry, in winter and summer.