Caves Trail (Craters of the Moon National Monument, ID)

Following a volcanic eruption, underground lava tubes serve as thoroughfares for draining molten lava. When the lava cools and remaining flows drain out of the tubes, the subterranean passageways remain, leaving behind caves to explore. There are several spots in the United States to see lava tubes, including Lava Beds National Monument in northern California, …

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Inferno Cone (Craters of the Moon National Monument, ID)

“A weird and scenic landscape, peculiar to itself” is how President Calvin Coolidge described the volcanic, lunar-like landscape in south-central Idaho when he created Craters of the Moon National Monument in 1924. In the years before the designation, hearty explorers and geologists had crisscrossed and documented the unique volcanic features of the area, discovering a …

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