Aso Caldera (Japan)
In Kyushu’s heart lies this 15-mile-wide volcanic complex with Mount Aso at its center. Eruptions have occurred as recently as 2021, though its last supervolcanic blast happened 90,000 years ago. Green crater lakes and steaming vents dot the landscape. Farmers work inside the caldera despite occasional ash falls. The steam rising from active areas creates misty, ethereal scenes that attract photographers.