1) Mendenhall Ice Caves

·         Mendenhall Ice Caves - Juneau, Alaska:

Mendenhall Glacier, a 12-mile-long mass of ice in Juneau, Alaska, is a popular tourist attraction. Few visitors, however, see the the glacier from its most spectacular vantage point: inside it. Rising global temperatures have caused the glacier to start melting—it has receded by about two miles since 1958. Water has carved caves into the interior, creating surreal, turquoise-toned worlds whose shapes are ever changing. A trip to the Mendenhall ice caves requires an arduous journey—it involves a kayak ride or long hike, an ice climb, and faith that the melting caverns won't collapse in on you—but the incredible landscapes are a once-in-a-lifetime sight.