アメリカ内務省のインスタグラム(usinterior) - 6月8日 00時21分

Sometimes you have to get below the surface to truly appreciate public lands. #Cave systems are fascinating places and can be found at several unique parks across the country. #JewelCave National Monument in #SouthDakota boasts over 195 miles of mapped and surveyed passages, an #underground wilderness that appeals to human curiosity. The splendor of this hidden gem is revealed through fragile formations and glimpses of brilliant color. Its maze of passages lure explorers, and its scientific wealth remains a mystery. Photo of a #lantern tour @jewelcavenps by Christopher Raborn (www.sharetheexperience.org). #CaveWeek #FindYourPark #usinterior

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