Cologne is Germany's fourth-largest city and has become a true metropolis. Situated close to the Rhine, it offers visitors a multitude of beautiful sights, historical monuments and wonderful excursions in the surrounding region. Cologne-Bonn Airport (CGN) is the perfect starting point for a city trip to Cologne. The city has something for everyone. Culture vultures will find a wealth of museums with different exhibitions throughout the year. The many bars, pubs and clubs make for many a colourful evening, with the locals staying out until the early hours on weekends especially. The Cologne carnival is, of course, a real annual treat. Bonn is precisely the right place for those in search of cultural entertainment. You can peruse the displays in the Art and Exhibition Hall or discover the diversity on offer at the König Zoological Museum. The former capital of Germany is a cultural stronghold on the Rhine, packed with theatres, museums, libraries and art galleries. The Federal Republic of Germany's ‘Haus der Geschichte’ (House of History), the König Zoological Museum and the Art and Exhibition Hall are all especially popular. Opera enthusiasts from all over Germany come to the performances at the Opera House in Beethoven's birthplace, and renowned scientists' lectures and research make the city into a very attractive university town. Students enjoy the summer's heat in the city's many cafés, and some of the country's best actors tread the boards at Bonn Theatre.