The Northwest Passage
Why now: It's the happy result of a sad phenomenon: Warming seas have made the once treacherous Northwest Passage the latest frontier in expedition cruising. Ships like the 1,070-passenger Crystal Serenity ply a route from Anchorage across the Canadian Arctic to Greenland before heading south for New York City.
What to see: This spectacular waterway connecting the Pacific and Atlantic Oceans passes through a stark and little-explored landscape of rock and ice. Highlights along the way include stops at remote Arctic villages and close encounters with the imperial polar bear.