I spent the night on a World War II submarine Airbnb that can sleep 65 people in sailors' bunks. Take a look inside.

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At the Wisconsin Maritime Museum in Manitowoc, you can descend a steep staircase into the USS Cobia, a US Navy submarine that sank 13 ships and earned four battle stars in World War II. You can walk through the rooms and learn about its history in combat from a US Navy veteran or self-guided audio tour.