Slide 2 of 61: Fancy walking along a frozen river in the Himalayas? Only for the brave, the Chadar Trek is a wild adventure. There's nothing quite like it in the world, as hikers take to the frozen surface of the Zanskar River to tour Ladakh's majestic mountain scenery. The hike passes remote villages and caves, and there's even a chance you'll see a snow leopard.