The Alaska Southeastern Coast is emerged as the Inside Passage, and has long been a popular cruise route. Left, a Celebrity Cruise ship makes a stop in Juneau.Southern Alaska has some of the most striking glaciers in the world, including Hubbard Glacier.The Hubbard Glacier is the largest tidewater glacier in North America. Unlike most glaciers, which are retreating, it’s been thickening and advancing toward the Gulf of Alaska since it was first mapped in 1895.