Welcome to the Worlds of Fun. Worlds of Fun is a 235-acre amusement park in Kansas City, Missouri, United States. The park opened in 1973 and was originally built by Mid-America Enterprises, owned by Lamar Hunt. Come check out the one and only Kansas City Amusement Park around. Come to Worlds of Fun to ride on and slide on all day long. Enjoy the day with them. Get big discounts with Worlds of Fun coupons for worldsoffun.com. Make use of Worlds of Fun promo codes & sales in 2017 to get extra savings on top of the great offers already on worldsoffun.com.