In southern Idaho lies a vast black lava field, created by a series of volcanic eruptions over the last 15,000 years. Managed by the National Park Service, it's a magical place, with a fierce, dry heat, astonishing sunsets and wildlife including eagles, owls and bats. It's crowning glory is a series of lava tube caves open to visitors, where you can scramble down over boulders to discover vast, cavernous tunnels under the black rock. Take a torch!

www.nps.gov/crmo/index.htm
Highway 26, Arco, ID, United States
+1 208 527 1300
Google map: bit.ly/qu5B2T

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