"Potsdam is home to hundreds of gorgeous buildings and landscaped parks, nearly all of which date back to the 18th and 19th centuries. Today, they're designated as UNESCO World Heritage sites—and while you won’t have time to see them all, a 90-minute cruise on the Havel River will give you a glimpse of a few while passing through a peaceful, often stunning, tree-lined landscape. From the boat, you'll see the castle in Babelsberg Park; the Glienicke Bridge, also known as the Bridge of Spies; and Cecilienhof Castle, where the Potsdam Agreement was signed in 1945." - Liz Humphreys