Just north of Flagstaff, Red Mountain offers hikers a rare opportunity to explore the inside of an ancient volcanic cinder ...

There is something quietly disorienting about standing in the middle of a high desert and realizing the ground beneath your ...

Explore California’s most underrated national park, where steaming fumaroles, bubbling mud pots, lava fields, and an active ...

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Most volcanoes, loud and pushing, build their cinder cones openly of fiery ash and lava. But a few volcanoes work under cover. Their molten lava never reaches the surface, but quietly pushes up the ...