Kayaking next to icebergs in Antarctica is both thrilling and humbling. The sheer size of these ice giants is hard to comprehend until you're gliding alongside them in a tiny kayak. Towering over me, one particular iceberg looked like a skyscraper rising out of the water, stretching for the clouds. Even after 15 minutes of steady paddling, my group still hadn’t circled the entire thing. I’d guess this iceberg was at least half a mile long, a quarter of a mile wide, and fifty feet tall above the surface. When you're surrounded by Antarctica's vast, empty wilderness, distances and sizes play tricks on your mind.