Cologne, and Cologne in English and French, is a big city, active nightlife with many bars and restaurants, but also old, full of history, monuments and sites. Period famous Cologne carnival is a good enough time to visit the city.
From Cologne you can make a boat trip on the Rhine to Strasbourg, France. The picturesque area of the route lies between St. Goar and Rüdesheim (many castles, vineyards, etc..). There are a rail route from Frankfurt to Cologne passing through Loreley, Rhine Valley an..... more details about Cologne