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The Devil's Tower Mystery
Devils Tower is a monolith located near Hulett and Sundance in eastern Wyoming. It rises dramatically 1267 feet (386 m) above the surrounding terrain.
In 1977 it was used as the location for the finale of Steven Speilberg's film Close Encounters of the Third Kind.
Black Hills area in which the tower is located, has some of the largest caves in the world underneath it, including Wind Cave and Jewel Cave
Aparently 3 American Indians found a tunnel: