Cologne is the fourth largest city in Germany and has more than a million inhabitants. The city was founded by the Romans and flourished during the Middle Ages. Cologne is the birthplace of eau de cologne and is known for its carnival and Christmas market. The famous cathedral shapes the skyline, but you also stumble upon creative shops and cozy cafés where you can taste the local Kölsch beer. Curious about what you can do in Cologne in 24 hours? In this article, you will discover the best tips for the metropolis on the Rhine.