Though it's a collection of scattered islands, Denmark's rail infrastructure is still impressive. A dense rail network spanning over 2500km connects the principal cities on the archipelago, and links Denmark with Germany and Sweden. There are high-speed lines departing hourly between the main towns on the islands, with the Great Belt Bridge replacing a 1hr ferry with a 10min train ride to link Zealand and Fulen. If you're travelling internationally, you'll likely arrive by sleeper train from Germany. And travelling by train is fantastically picturesque within Denmark too. Take advantage of regional trains that follow the Jutland coast or board a train to Malmö, crossing the magnificent Øresund Bridge en route to your Swedish destination.