Twelve places to look into a volcano, from the milky blue lake in Víti crater at Askja in Iceland and the Red Crater on New Zealand's Tongariro Alpine Crossing to the steaming vents of Poás in Costa Rica and Nakadake on Mount Aso. Ubehebe in Death Valley and the Silvestri craters on Etna are easy walks from the car. Active volcanoes close at short notice, and Aso, Poás, Taal and Kilauea have all had access limits in recent years, so check before you go.
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