Antarctica is a formidable icy seductress, provoking feelings of wonder and trepidation in varying degrees like nowhere else on earth. Ever since the White Continent was formally discovered a little more than 200 years ago,

Cruises often get a bad rap for not offering much in the way of fitness or outdoor adventure. But there are some thrilling itineraries with adrenaline-fueled excursions, from polar expeditions to invigorating river cruises.