Harv Greenberg Photography. “Ice Skyscraper” – Antarctica. While wisps of cirrus mimic the great ice fortress, the wind wraps around the crystalline architecture. The icebergs that crest Antarctica’s seas can rival the scale of city blocks, and rising from the ocean, they create their own breathtaking skyline. Each winter, sea ice up to almost 10-feet thick forms outward from the continent, making a belt 300 to 900 miles wide. Even in summer the sea ice belt is 90 to 500 miles wide.