Deep in the woods of central Pennsylvania, off a winding two-lane road, sits an oasis-Knoebels Amusement Resort. With over 60 rides of all types, along with two campgrounds and a golf course, Knoebels advertises itself as America's largest free-admission amusement park. 
It has come a long way since 1926, when Hartman Henry Knoebel first opened a swimming pool, restaurant, and carousel at his farm outside Elysburg. It was one of dozens of small picnic parks located in the region at the time. But unlike its onetime peers, Knoebels managed to thrive and grow under the careful stewardship of five generations of the Knoebel family, adding transformative attractions such as the Grand Carousel in 1942, Haunted Mansion in 1973, Phoenix in 1985, Twister in 1999, and Flying Turns in 2013. Today, Knoebels Amusement Resort is a beloved institution drawing countless visitors annually.
Jim Futrell, historian for the National Amusement Park Historical Association and International Association of Amusement Parks and Attractions, has passionately studied the amusement park industry for over 50 years and in that time has authored dozens of articles and 10 books on the industry.