This Photo Friday features the Mendenhall Ice Caves, located inside the Mendenhall Glacier of Juneau, Alaska. This particular glacier is one of 38 glaciers that is part of the 1500-square-mile Juneau Ice Field, which runs for 13 miles into the Mendenhall Valley, ending at Mendenhall Lake. These ice caves are difficult to access. To get inside, one must kayak around and then climb over the glacier. This glacier is monitored by the Juneau Icefield Research Program, and their research has shown that this glacier has receded almost two miles since 1958. It previously receded only half a mile in the years between 1500 and 1958.