Cologne is Germany’s fourth-largest city, and its largest in the Rhineland. It’s an ancient city, founded by the Romans in the first century AD, and its cathedral is a Unesco World Heritage Site. The city is also famous for its beer, with more than a dozen breweries and dozens of beer halls. Cologne is a lively city, with a large student population, and it’s well known for its carnival, which is one of the largest in Europe.