Germany’s fourth-largest city, home to more than one million inhabitants, spans both banks of the Rhine River, although the eastern side is the more important one for visitors. The city's medieval center and its most famous attraction, twin-spired Cologne Cathedral, are easily reached on foot, either independently or with a tour group. Most of Cologne was destroyed during World War II, and its subsequent revival — with many buildings meticulously reconstructed in the original style — was quite miraculous.