アメリカ内務省のインスタグラム(usinterior) - 9月4日 03時35分

Over the last half-million years, volcanic eruptions on the #MedicineLake shield volcano have created a rugged landscape dotted with diverse volcanic features at #LavaBeds National Monument in #California. With more than 700 #caves at @lavabedsnps, the park is worth exploring! Video by Steve Bumgardner (@yosemitesteve).

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