Soo Locks visitors watch as Canadian and American ships lock through in opposite directions; Sioux Sainte Marie, Michigan.

Visitors watch as the ore freighter Canadian Miner steams eastward through the Soo Locks and leaves Lake Superior; Sioux Sainte Marie, Michigan.

Dock worker pulls tow lines as if walking a dog as ore freighter Canadian Miner pulls into the Soo Locks traveling eastward; Sioux Sainte Marie, Michigan.

Ore freighter Canadian Miner steams eastward through the Soo Locks while the much higher American Enterprise departs westward onto Lake Superior; Sioux Sainte Marie, Michigan.

Ore freighter Canadian Miner steams eastward through the Soo Locks as it exits Lake Superior; Sioux Sainte Marie, Michigan.

Point Iroquois Light, with its 1902 keeper's quarters and 65-foot-tall 1871 lighthouse, once guided ships across Whitefish Bay to and from the Soo Locks; Point Iroquois, Michigan.

Sandy beach on Whitefish Bay leads to Point Iroquois Light, with its 1902 keeper's quarters and 65-foot-tall 1871 lighthouse that once guided ships to and from the Soo Locks; Point Iroquois, Michigan.

Young girl plays in sand at sunset on Lake Superior beach; Point Iroquois, Michigan.

Sun sets over Lake Superior on a June evening at Point Iroquois, Michigan.

Point Iroquois Light caretaker John Zier, who grew up in the keeper's quarters, stands atop 65-foot-tall 1871 lighthouse scoping Lake Superior with binoculars; Point Iroquois, Michigan.

Young girl gazes at Lake Superior through telescope atop 65-foot-tall 1871 lighthouse at sunset; Point Iroquois, Michigan.

Whitefish Point Light Station, with its 76-foot-tall lighthouse and Lightkeeper's Quarters built in 1861, is part of the Great Lakes Shipwreck Museum complex at Whitefish Point, Michigan.

Whitefish Point Light Station features 76-foot-tall lighthouse and Lightkeeper's Quarters erected in 1861, part of the Great Lakes Shipwreck Museum complex at Whitefish Point, Michigan.

Exhibits inside Great Lakes Shipwreck Museum range from lighthouse lenses to ship models to artifacts retrieved from shipwrecks including the bell of the Edmund Fitzgerald ore freighter; Whitefish Point, Michigan.

Exhibits inside Great Lakes Shipwreck Museum range from lighthouse lenses to ship models to artifacts retrieved from Lake Superior shipwrecks; Whitefish Point, Michigan.

Man reflects on exhibit discussing the doomed Edmund Fitzgerald, an ore freighter which sank in 535 feet of icy Lake Superior water in a November 1975 gale; Great Lakes Shipwreck Museum, Whitefish Point, Michigan.

Exhibit quotes final radio communications with the doomed Edmund Fitzgerald, an ore freighter which sank in 535 feet of icy Lake Superior water in a November 1975 gale; Great Lakes Shipwreck Museum, Whitefish Point, Michigan.

Exhibit at Great Lakes Shipwreck Museum features vintage diving gear; Whitefish Point, Michigan.

Diroama at Great Lakes Shipwreck Museum depicts modern scuba divers descending on an old Lake Superior shipwreck; Whitefish Point, Michigan.

Replica of a typical 26-foot rescue boat used by the U.S. Lifesaving Service in the early 1900s sits on display in the 1923 Surfboat House at the Great Lakes Shipwreck Museum; Whitefish Point, Michigan.

Diorama in 1861 Lightkeeper's Quarters depicts keeper at his desk; Great Lakes Shipwreck Museum, Whitefish Point, Michigan.

Sign beside boardwalk platform explains why Whitefish Point has been a magnet for shipwrecks in the 200 years of commercial navigation on Lake Superior; Whitefish Point, Michigan.

Carefree boys play on dock ruins as ore freighter passes over deep, frigid waters where the legendary Edmund Fitzgerald and many other shipwrecks lie; Whitefish Point, Michigan.

Writer Susan Zimmerman gazes across Lake Superior as 1861 lighthouse flashes over region where many shipwrecks lie, including Edmund Fitzgerald; Whitefish Point, Michigan.

Young girl runs down sand dune with glee at Pictured Rocks National Lakeshore, Michigan.

Woman sits atop sand dune overlooking Lake Superior at Pictured Rocks National Lakeshore, Michigan.

Sable Falls cascades over sandstone ledges at Pictured Rocks National Lakeshore, Michigan.

Young girl with braid walks through field of tall grasses at Pictured Rocks National Lakeshore, Michigan.

Speedboat whisks kids on inflatable rafts past Lake Superior homes in Eagle Harbor, Keweenaw Peninsula, Michigan.

Colorful beach umbrella stands alone on sandy Lake Superior beach at Eagle Harbor on the Keweenaw Peninsula, Michigan.

Storm clouds obscure late day sun over pastoral stretch of rural Highway 38 near Ontonagon, Michigan.

Lone fisherman stands waist deep in cold Lake Superior waters in Union Bay on a summer evening near Porcupine Mountains State Park; Silver City, Michigan.

Lone fisherman stands waist deep in the cold Lake Superior waters of Union Bay on a summer evening; Silver City, Michigan.

Young girl in moccasins sits on giant moccasin of Hiawatha statue at Ironwood, Michigan.

Ore freighter passes through Duluth Ship Canal and under Aerial Lift Bridge as it enters harbor at Duluth, Minnesota.

Visitors explore Vietnam War Memorial on Lake Superior at Duluth, Minnesota.

Visitor pauses to reflect inside Vietnam War Memorial on Lake Superior at Duluth, Minnesota.

Marble wall reflects visitor inside Vietnam War Memorial on Lake Superior at Duluth, Minnesota.

Vietnam War Memorial frames distant ore freighter on Lake Superior at Duluth, Minnesota.

Little girl marvels at gulls feeding on lawn in Canal Park on a summer evening at Duluth, Minnesota.

Bright red rail contrasts with distant sailboat and deep blue waters of Lake Superior at Duluth, Minnesota.

Teenage girl walks along Lake Superior shore catching last rays of sunset as distant ore freighter approaches Duluth, Minnesota.

Little girl in red hat stands next to mother on Lake Superior shore catching last rays of sunset at Duluth, Minnesota.

Evening sky and Lake Superior silhouette gazebo at Leif Ericson Park Rose Garden in Duluth, Minnesota.

Orange hawkweed wildflower grows at Gooseberry Falls State Park on the shores of Lake Superior, MInnesota.

Still life of boulder, grass and pool of lakewater at Gooseberry Falls State Park on the rocky shore of Lake Superior, MInnesota.

Girls hunt for tadpoles in pool of water on the rocky shore of Lake Superior at Gooseberry Falls State Park, MInnesota.

Red squirrel feasts on sunflower seeds on bird feeder at Gooseberry Falls State Park, MInnesota.

Split Rock Lighthouse, built 1910 atop 130-foot (43-meter) cliff, overlooks calm evening waters of Lake Superior, Minnesota.

White-tailed deer buck with antlers in velvet pauses in high grasses of Split Rock Lighthouse State Park on Lake Superior, Minnesota.

Woman sits atop cliff at Palisade Head in Tettegouche State Park overlooking clear blue waters of Lake Superior, Minnesota.

Colorful rocks at Sugerloaf Cove hold clues to the dynamic volcanic and glacial forces that formed Lake Superior, Minnesota.

Sunrise over Lake Superior shore at Temperance River State Park, Minnesota.

Portrait of whiskered, unshaven camper at Temperance River State Park, Minnesota.

Bare-chested man jumps from high rock into Temperance River at Temperance River State Park, Minnesota.

Lupine wildflowers frame view of Lutsen Resort, built 1894 on the Lake Superior shore, Minnesota.

Three lone wooden chairs sit in row on beach at Lutsen Resort overlooking Lake Superior, Minnesota.

Giant walleye jumps through roof of Beaver House fishing lure shop at Grand Marais on Lake Superior, Minnesota.

Hjordis, a two-masted, 50-foot, gaff-rigged schooner owned by North House Folk School, sails near Grand Marais on Lake Superior, Minnesota.

Gentle surf laps shore between two boulders as Hjordis, a two-masted, 50-foot, gaff-rigged schooner owned by North House Folk School, sails crystalline waters of Lake Superior near Grand Marais, Minnesota.

Tired tourists rest on sun-warmed rocks of Artist Point on Lake Superior at Grand Marais, Minnesota.

Ornate 30 x 80-foot dining room is covered with Cree Indian designs painted by French artist Antoine Goufee across its 20'-high domed ceiling at Naniboujou Lodge, Minnesota.

Small sign nailed to birch tree marks the Superior Hiking Trail where it runs along the Brule River in Judge C.R. Magney State Park, Minnesota.

White admiral butterflies (Limenitis arthemis) sip water on a rocky bank of the Brule River along the Superior Hiking Trail, Minnesota.

White Admiral butterfly (Limenitis arthemis) seeks water on a rocky bank of the Brule River along the Superior Hiking Trail, Minnesota.

Reconstructed log buildings depict kitchen (left) and great hall (right) of 18th-century North West Company trading post at Grand Portage National Monument, Minnesota.

Reconstructed stockade fence and lookout tower sit on archeological footprints of original 18th-century North West Company trading post at Grand Portage National Monument, Minnesota.

Vintage glass blurs view through kitchen window of stockade fence and canoe warehouse at reconstructed 18th-century North West Company trading post at Grand Portage National Monument, Minnesota.

Costumed guide blows on clump of burning rope ignited with flint in great hall of reconstructed 18th-century North West Company trading post; Grand Portage National Monument, Minnesota.

Costumed guide lectures about boats and river travel in canoe warehouse at reconstructed 18th-century North West Company trading post; Grand Portage National Monument, Minnesota.

Young girl wears hat of wealthy fur trader in great hall of reconstructed 18th-century North West Company trading post; Grand Portage National Monument, Minnesota.

Replica 18th-century playing cards sit on display at reconstructed North West Company trading post; Grand Portage National Monument, Minnesota.

Guide dressed as Scottish fur trader plays bagpipes outside stockade fence on Lake Superior at reconstructed 18th-century North West Company trading post; Grand Portage National Monument, Minnesota.

St. Louis River, a major tributary of Lake Superior, flows through Jay Cooke State Park, Minnesota.

Ferry boat, the Island Queen, travels Lake Superior carrying cars and passengers between Madeline Island in the Apostle Islands and Bayfield, Wisconsin.

Cars and bicycles travel aboard small ferry bound for Madeline Island in the Apostle Islands across from Bayfield, Wisconsin.

Young couple kisses aboard ferry bound for Madeline Island in the Apostle Islands across from Bayfield, Wisconsin.

Passengers aboard sailboat, Silver Bullet, dangle legs over side as they near finish line of the Around the Islands Race in the Apostle Islands, Wisconsin.

Kayakers paddle calm Lake Superior waters on a summer eve in Bayfield, Wisconsin.

Bride and flower girl arrive for wedding celebration at Tom's Burned Down Cafe on Madeline Island in the Apostle Islands, Wisconsin.

Bride arrives for wedding celebration at Tom's Burned Down Cafe on Madeline Island in the Apostle Islands, Wisconsin.

Groom holds young daughter while sitting at bar during wedding celebration at Tom's Burned Down Cafe; Madeline Island in the Apostle Islands, Wisconsin.

Young daughter of bride and groom waits among bar regulars during wedding party at Tom's Burned Down Cafe on Madeline Island in the Apostle Islands, Wisconsin.

Sarcastic signs abound at Tom's Burned Down Cafe on Madeline Island in the Apostle Islands, Wisconsin.

Sarcastic signs abound at entrance to Tom's Burned Down Cafe on Madeline Island in the Apostle Islands, Wisconsin.

Couple kisses in front of old delivery truck that serves as snack shop at Tom's Burned Down Cafe on Madeline Island in the Apostle Islands, Wisconsin.

Cars stop at main intersection leading to marina on Lake Superior in Bayfield, Wisconsin.

Steep street appears to plunge straight into Lake Superior as sailboat drifts by; Bayfield, Wisconsin.

Hot woman in short dress and platform shoes fans herself as she walks home alone on a warm summer evening in Bayfield, Wisconsin.

Kayaks line up at Meyers Beach on Lake Superior, a popular spot in Apostle Islands National Lakeshore for accessing the Sea Caves on the Bayfield Peninsula; Cornucopia, Wisconsin.

Fort William Historical Park, a 25-acre, 42-building recreation of the North West Company headquarters and trading post originally located nine miles downstream at mouth of the Kaministiquia River; Thunder Bay, Ontario, Canada.

Replica of parcels packed with beaver furs fill warehouse at Fort William Historical Park, a recreation of the original nearby North West Company headquarters and trading post; Thunder Bay, Ontario, Canada.

Guides dressed as fur traders banter in warehouse at Fort William Historical Park, recreation of original nearby North West Company headquarters and trading post; Thunder Bay, Ontario, Canada.

Guide dressed as fur trader leans on pile of furs in warehouse at Fort William Historical Park, recreation of original nearby North West Company headquarters and trading post; Thunder Bay, Ontario, Canada.

Furs hang in warehouse at Fort William Historical Park, recreation of original nearby North West Company headquarters and trading post; Thunder Bay, Ontario, Canada.

Portrait of guide dressed as Ojibwe maiden at Fort William Historical Park; Thunder Bay, Ontario, Canada.

Guide dressed as Ojibwe maiden poses with young girl beside birch bark canoe at Fort William Historical Park; Thunder Bay, Ontario, Canada.

Visitors paddle birch bark canoe at Fort William Historical Park on the Kaministiquia River; Thunder Bay, Ontario, Canada.

Guide dressed as French fur trader steers birch bark canoe at Fort William Historical Park on the Kaministiquia River; Thunder Bay, Ontario, Canada.

Sunset washes across Kaministiquia River atop 39m (120-foot) high Kakabeka Falls at Kakabeka Falls Provincial Park; Thunder Bay, Ontario; Canada.

Tim Lukinuk of Amethyst Mine Panorama, uses high-pressure water hose to strip rock face and extract amethyst from his family's mine, largest deposit in Canada; Dorion, Ontario.

Tim Lukinuk of Amethyst Mine Panorama, uses high-pressure water hose to strip rock face and extract amethyst from his family's mine, largest deposit in Canada; Dorion, Ontario.

Steve Lukinuk, president of Amethyst Mine Panorama, holds amethyst up to sun to spot embedded gemstones; Dorion, Ontario; Canada.

Amethyst mined at Amethyst Mine Panorama glistens in sun; Dorion, Ontario, Canada.

Three-kilometer-long, 100-meter deep, 150-meter wide canyon harbors arctic flowers in its depths left from last ice age; Ouimet Canyon Provincial Park, Ontario, Canada.

Young girl stands on viewing platform overhanging 100-meter-deep canyon formed from rifting and glacial erosion of billion-year-old volcanic formation; Ouimet Canyon Provincial Park, Ontario, Canada.

Panoramic view from Highway 17 rest area overlooks Nipigon Bay, northernmost extent of Lake Superior; Ontario; Canada.

Cyclist crossing Canada by bike poses in shirt emblazoned with national symbol of maple leaf; Rossport, Ontario, Canada.

Field of orange hawkweed wildflowers frames girl on swing on a summer morn at Lake Superior; Rossport, Ontario, Canada.

Little girl wades in small lagoon on Lake Superior at Neys Provincial Park, Ontario; Canada.

Man pushes wife in kayak out onto Lake Superior from stony beach at Terrace Bay, Ontario; Canada.

Aguasabon Falls and Gorge cut through fracture in 2.6 billion-year-old granodiorite bedrock to Lake Superior shore at Terrace Bay, Ontario; Canada.

Winnie-the-Pooh statue commemorates female bear cub Captain Harry Colbourn bought here before shipping out to Europe in WWI and leaving cub in London Zoo where A.A. Milne immortalized it in famous book; White River, Ontario, Canada.

Canada goose statue (2.2 tons, 8.5m high) commemorates 1960 completion of Lake Superior Circle Tour link and Ojibwe translation of town's name; Wawa, Ontario; Canada.

Agawa Rock, famous for its centuries-old Ojibwe pictographs, looms by Lake Superior in Lake Superior Provincial Park, Ontario; Canada.

Centuries-old Ojibwe pictograph of mythological creatures and canoe hunting party is one of several story scenes that adorn Agawa Rock in Lake Superior Provincial Park, Ontario; Canada.

Mother and daughter admire centuries-old Ojibwe pictograph of mythological creatures, one of several story scenes that adorn Agawa Rock in Lake Superior Provincial Park, Ontario; Canada.

Mother and daughter sit and relax on Agawa Rock, famous for its Ojibwe pictographs; Lake Superior Provincial Park, Ontario; Canada.

Sunset over Agawa Bay, Ontario; Canada

Sunset over Agawa Bay, Ontario; Canada