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World's Strangest Bridges

World's Strangest Bridges: Alaskan ice bridges

National Geographic/Getty Images

Ice Bridges: Alaska

Every frigid winter, Mother Nature builds her own bridges across Alaskan lakes and rivers, and locals reinforce them by thickening the ice with a mixture of water, ice chips, and snow. These ice bridges are so strong that they are often used when the route over a man-made bridge cannot support the heavy load of a fully laden semi-trailer.

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