Silverwood Theme Park is an amusement park located in the city of Athol in northern Idaho, United States, near the town of Coeur d'Alene, approximately 47 miles (76 km) from Spokane, Washington on US 95. Owner Gary Norton opened the park on June 20, 1988. Originally, the park included a small assortment of carnival rides, a "main street" with shops and eateries, and an authentic steam train that traveled in a 30-minute loop around the owner's property. From 1973 to 1988, the land, along with a fully functioning airstrip, was operated as the Henley Aerodrome, named after the family whom Norton bought it from in 1981.

A Giant Inverted Boomerang is a type of steel shuttle roller coaster manufactured by the Dutch firm Vekoma. The ride is a larger, inverted version of Vekoma's popular Boomerang sit down roller coasters. As of May 2024, four installations of the model are operating, with another one under construction.