Picture/photo (Caves): Cave mouth, where strong winds equalize pressure between inside outside. Wind Cave National Park, South Dakota, USA.

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Cave mouth, where strong winds equalize pressure between inside outside. Wind Cave National Park, South Dakota, USA.

Cave mouth, where strong winds equalize pressure between inside outside. Wind Cave National Park, South Dakota, USA.

Photo ID# wica0579

Location: Wind Cave

Subjects: Caves, Geology, Inside, Intimate Landscapes, Nobody, Wilderness

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