More of Alaska -- over 100 times more -- is covered by glacier ice than is settled by human beings.
Grand Pacific Glacier (Glacier Bay National Park): Two vast glaciers of deep blue meet at the top of an utterly barren fjord. They rubbed and creased the gray rock below for thousands of years before just recently releasing it to the air again. Three intimidating walls of ice surround boats that pull close to the glaciers.
Childs Glacier (Cordova): Out the Copper River Highway from Cordova, this is a participatory glacier-viewing experience. The glacier is cut by the Copper River, which is 1/4-mile broad; standing on the opposite shore (unless you're up in the viewing tower), you have to be ready to run like hell when the creaking, popping ice gives way and a huge berg falls into the river, potentially swamping the picnic area. Even when the glacier isn't calving, you can feel the ice groaning in your gut.
Exit Glacier (Seward): You can drive near the glacier and walk the rest of the way on a gravel path. It towers above like a huge blue sculpture, the spires of broken ice close enough to breathe a freezer-door chill down on watchers.
Western Prince William Sound: On a boat from Whittier, you can see a couple dozen glaciers in a day. Some of these are the amazing tidewater glaciers that dump huge, office-building-size spires of ice into the ocean, each setting off a terrific splash and outward-radiating sea wave.