Pictograph Cave State Park near Billings, Montana has several caves with Native American pictographs up to 2,100 years old. The spherical concretions in and around Ghost Cave are very unique.
Ghost Cave
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Pictograph Cave State Park near Billings, Montana has several caves with Native American pictographs up to 2,100 years old. The spherical concretions in and around Ghost Cave are very unique.
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