In 2006, the Timber Tower ride, along with Lil' Loggers Landing, Beaver Creek, Beaver Creek Boat Float, and Lumberjack Lifts, opened in a new area adjacent to Thunderhead. The Barbeque & Bluegrass festival also premiered. The 2007 season included the addition of Mystery Mine, a Gerstlauer Eurofighter coaster with two vertical lifts, a 95-degree 85 ft (26 m) drop, a heartline roll, and a dive loop. The $17 million ($20. 5 million in 2018 dollars ) ride used an abandoned mine shaft theme. In 2008, River Battle, an interactive water raft ride, was built in a new section of the park called Wilderness Pass that connected the Timber Canyon and Craftsman's Valley areas. "Thunder Road" returned to the motion theater (Imagination Cinema) and replaced Smoky Mountain Wilderness Adventure. Della's Lye Soap shop moved from Craftsman's Valley to the Wilderness Pass area. A new exhibit housing the Wings of America show birds moved to its former location. The Polar Express 4-D Experience was shown in Imagination Cinema during the park's Smoky Mountain Christmas.