The next day, we decided to explore Copenhagen through its waters. It's harbors and idyllic canals provide a magnificent view of the city. I took the Grand Canal Tour. You get lost in the unforgettable views of the Opera House, Amalienborg Palace, Black Diamond Library, the Little Mermaid, bridges, warehouses turned apartments, houses in metro sexual colors; ships in the harbor, and so on. And then comes the warning. “Look out, ladies and gentlemen,” a voice implores over the speakers, “mind your heads!” We look up to see a bridge so low and narrow that the sides and the roof of the boat are but inches away from it. We promptly bend our heads.