Cologne (German: Köln, pronounced [ˈkœln]) is Germany's fourth-largest city with more than one million inhabitants. It is the largest city both in the German Federal State of North Rhine-Westphalia and within the Rhine-Ruhr Metropolitan Area, one of the major European metropolitan areas. It is one of the oldest cities in Germany, having been founded by the Ubii in the year 38 BC. The name is derived from that of the Roman settlement, Colonia Claudia Ara Agrippinensium. 

Cologne lies on the River Rhine. The city's famous Cologne Cathedral (Kölner Dom) is the seat of the Catholic Archbishop of Cologne. The University of Cologne (Universität zu Köln) is one of Europe's oldest universities.

Cologne is a major cultural center of the Rhineland and has a vibrant arts scene. Cologne is home to more than 30 museums and hundreds of galleries. Exhibitions range from local ancient Roman archeological sites to contemporary graphics and sculpture. The Cologne Trade Fair hosts a number of trade shows such as Art Cologne, imm Cologne International Furniture Fair and the Photokina. Cologne is also well-known for its celebration of Cologne Carnival, the annual reggae summerjam, and Cologne Gay Pride.

Within Germany, Cologne is known as an important media center. Several radio and television stations, including Westdeutscher Rundfunk (WDR), RTL and VOX, have their headquarters in the city. Both Pro7 and Sat.1 produce TV shows in Cologne as well. Further, the city hosts the Cologne Comedy Festival, which is considered to be the largest comedy festival in mainland Europe. 

SOURCE: Wikipedia