Mystery Mine is a Gerstlauer Euro-Fighter roller coaster at Dollywood, a theme park in Pigeon Forge, Tennessee. The ride is heavily themed as a haunted mining operation from the 19th century, with sections taking place outdoors and within a large building that features special effects. At a cost of $17.5 million to construct, Mystery Mine was Dollywood's largest single-attraction investment until 2012 when Wild Eagle was constructed for $20 million. It was the first Gerstlauer Euro-Fighter installation in the United States, and, at the time of its opening, had the steepest drop of any coaster in North America, until Steel Hawg at Indiana Beach was built in 2008. The ride was installed by Ride Entertainment Group, who handles all of Gerstlauer's operations in the Western Hemisphere.