Sail into the protected waters of Glacier Bay National Park, a UNESCO World Heritage Site, for spectacular front-row views of the park’s massive rivers of ice—including the Johns Hopkins and Margerie glaciers—where they meet the ocean. Along the way, National Park rangers board the ship to impart their knowledge of the region, and with any luck, you may hear the thunderous snap and witness the Homeric splashes of house-size icebergs as they calve into the sea.

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