MINNEAPOLIS — Lake Superior is the largest freshwater lake in the world — a sea known for its pristine cold water. But in a warming world, that's changing.

Lake Huron sits on the border between the U.S. and Canada. The freshwater lake features state parks, great fishing and underwater shipwreck preserves. Dozens of lighthouses line the Michigan ...

Lake Michigan is the only Great Lake located fully in the U.S. The freshwater lake features more than 100 lighthouses. A national lakeshore offers sand dunes and 35 miles of shoreline.

The colorful rainbow that we all know and love has a ghostly cousin—the fogbow. And one of these ethereal aerial arches has been spotted above Lake Baikal —the world's largest freshwater lake ...

A MARTÍNEZ, HOST: In California's Central Valley, a once-vibrant lake is back, and that's not necessarily a good thing. Tulare Lake used to be the largest freshwater lake west of the Mississippi.