Sitting at the edge of Lake Toya, this compact museum brings you face-to-face with the raw power of Usu-zan through gripping video footage of eruptions in action. You'll see before-and-after photos showing entirely new land masses forming, geological cross-sections that explain the caldera's birth, and exhibits on the cutting-edge detection science pioneered here. It's a fascinating primer before taking the ropeway up to the volcano itself, and a reminder that the placid lakeside scenery is just the calm between geological upheavals.