Cooler climes are some of today's hottest cruise destinations. Add the warmth of Seabourn's ultra-luxury service, boutique-hotel inspired ships, world-class dining and insightful, intriguing shore excursions like Ventures' active explorations, and you've got the perfect formula for discovering gateway northern destinations like Alaska, as well as the uniquely northern-most destinations in Europe.WATCH THE VIDEO ABOVE FOR A SHIP TOUR AND HIGLIGHTS OF OUR CRUISE.And here are three essential experiences I discovered you won't want to miss on a cruise of Nordic...