Since the 1800s, tourists have flocked from all over Europe and beyond to the alpine Swiss village of Grindelwald to examine its glaciers and take in the view from "the top of Europe," as local boosters describe it. Now, you've got to hike farther to reach the glaciers — and you'd better watch your step, as the permanent ice that has held together large chunks of mountain is melting fast, bringing on rock slides. For the time being, the Swiss are capitalizing on these unusually dramatic demonstrations of climate change, offering educational tours that highlight the drama while steering clear of known danger zones