The Wonder Bar in Casper, Wyoming is a reputedly haunted location known for a variety of ghostly phenomena, including unexplained lights turning on, cold spots, and the lingering presence of spirits, possibly tied to its long history since 1914 as a horse-friendly pool hall and later a bar. A significant building with cowboy and oil boomtown roots, the Wonder Bar is featured on Casper ghost tours due to its reported supernatural activity. Lights have been observed turning on and off by themselves. Visitors have reported experiencing areas with sudden drops in temperature. The atmosphere of the building is said to be so active that spirits are believed to still linger there.