We drove up to Mount St. Helen’s in Washington and explored Ape Cave, “the longest continuous lava tube in the continental United States and the third longest (in total mapped length) lava tube in North America at 2.5 miles.” (Thanks Wikipedia)
We drove up to Mount St. Helen’s in Washington and explored Ape Cave, “the longest continuous lava tube in the continental United States and the third longest (in total mapped length) lava tube in North America at 2.5 miles.” (Thanks Wikipedia)