Benjamin Olson / Skim ice in negative thirty degree fahrenheit at sunrise, Lake Superior, Grand Portage National Monument, Minnesota

Benjamin Olson / Cave at night during polar vortex, Lake Superior, Tettegouche State Park, Minnesota, multiple exposures

Jim Brandenburg / Forest on lake shore, Judd Lake, Superior National Forest, Minnesota

Thomas Lazar / Ice hanging from arch in sea cave carved in soft sandstone cliffs, frozen lake, Squaw Bay, Lake Superior, Apostle Islands National Lakeshore, Wisconsin, USA, February 2009

Tim Fitzharris / Castle Rock overlooking Lake Superior, Pictured Rocks National Lakeshore, Michigan

Jim Brandenburg / Ice along the shore of Burntside Lake at sunset, Superior National Forest, Minnesota

Jim Brandenburg / Moose Lake shoreline covered in frost, Minnesota

Jim Brandenburg / Ice crystals, Lake Superior, Michigan

Jim Brandenburg / Canoe bow with autumn trees, Discovery Lake, Superior National Forest, Minnesota

Jim Brandenburg / Red Pine (Pinus resinosa) at edge of lake in Boundary Waters Canoe Area Wilderness with 1200 miles of canoe routes, part of Superior National Park, Minnesota

Jim Brandenburg / Water Lily (Nymphaea sp) cluster in pond surrounded by coniferous forest, Boundary Waters Canoe Area Wilderness, Minnesota

Jim Brandenburg / Water Lily (Nymphaea sp) cluster in pond surrounded by coniferous forest, Boundary Waters Canoe Area Wilderness, Minnesota