The second-largest city in Germany, Hamburg, appears to be a great city-trip destination year-round. Thought you’d end up in a grubby city, full of concrete, industry and air pollution? Guess again. Hamburg is more of a ‘green city’ than one might think. Full of city parks, charming old buildings and villa’s… and of course the big Alster lake, Hamburg is actually quite chique. A perfect hang out for a Friday night cocktail (or any other night for that matter) is the 20up sky bar in the Riverside Hotel. On the 20th floor of this hotel, 90 meters above the roofs of Hamburg, the bar gives you an unforgettable view of the Elbe, the harbour and the city itself. Floor-to-ceiling windows (7 meters high!) and a cocktail menu the size of a phone book will make you stay up very late. Booking a room at the Riverside Hotel might not be a bad idea.