Menengai Caldera (Kenya)
Africa’s hidden volcanic powerhouse left a 7-mile-wide crater after its last eruption 8,000 years ago. Now, farmers cultivate the fertile slopes while geothermal plants tap its energy. Steam vents dot the vast caldera floor. The Rift Valley location makes this volcano part of an active tectonic zone. Local traditions include legends about spirits inhabiting the crater, perhaps remembering ancient eruptions.