Though Norway contains the largest number of fjords in the world, Sognefjord is the largest (and second-largest in the world), and probably most beautiful as well. With depths that go down nearly a mile and peaks that go over one into the air, you could spend many years just trying to see everything this 127-mile (205km) long waterway has to offer. And you'd need plenty of help, but thankfully there's dozens and dozens of boats that troll these crystal-clear waters daily.