アメリカ内務省のインスタグラム(usinterior) - 7月1日 00時25分

Descend into a fascinating underground world at Mammoth Cave #NationalPark in #Kentucky. With over 360 miles of mapped passages, the park preserves the longest cave system in the world. Each year, more than 2 million people visit #MammothCave. Some strolling through large chambers and past unique rock formations while others challenge themselves with a wild #cave tour along drop offs and through tight spaces. Photo of a cave entrance by Eric Blankenship (www.sharetheexperience.org). #FindYourPark #usinterior

[BIHAKUEN]UVシールド(UVShield)

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