Cologne is a city on the Rhine river in North Rhine-Westphalia. It is the fourth largest city in Germany with around one million residents. It is one of the nation's media, tourism and business hotspots, and is considered one of the most liberal cities in Germany.
Cologne has a rich history, reaching back to the time of the ancient Roman Empire, when it was founded. It has remained a constantly inhabited important regional centre since. Compared to other German and European cities, the ancient and medieval Cologne was relatively large, covering most of the modern-day city centre.
Cologne is, however, not only a tourist destination, but on an equal note a major economic centre, a globally important trade fair location, a culture and media hotspot and a major transportation hub. This equal mix of roles and functions is permeable throughout the city and provides it with a constant inflow of various visitors, as well as a very diverse population mix. This all culminates during the traditional Karneval, and makes Cologne one of the most-visited destinations in Germany.