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Volcano, the campy 1997 disaster movie starring Tommy Lee Jones, is a favorite of my wife Alisa. She digs geology. So she felt right at home exploring Yellowstone National Park, which sits atop a volcanic caldera and supervolcano. We had only two days here but got to visit several thermal attractions. It was a landscape of extremes. The ground was steaming hot on a 32-dgree day. We drove through snow flurries. Parts of Lake Yellowstone were still frozen in mid-May. Our favorite hot spots were Mammoth Hot Springs (above), where bison and elk mingle with tourists, and the Mud Volcano, a bubbling, seething spring. The green ooze below is a shallow thermal pool.