At times it may seem like winter, with its short days and long dark nights, the bitter cold, and the snow and ice it brings, will never end. But spend even a week or two exploring the Apostle Islands National Lakeshore, and you'll discover it's simply not true. Winter, like the ice on Lake Superior, is ephemeral - freezing, melting, and changing by the hour. And watching the changes in the ice can become a compelling spectator sport.Consider the rare one day ice cave viewing season. Thousands of people trekked across 2 miles of ice to explore the mainland ice caves on February 16th. At the...