Here are a few suggestions for your next trip from Rolandseck

In 2 hours, you can reach Köln, Düsseldorf, Essen, Dortmund.

In 3 hours, you can reach Brussels, Frankfurt am Main, Liège, Anderlecht, Eindhoven, Schaerbeek, Leuven, Nijmegen, Molenbeek-Saint-Jean, Arnhem...

In 4 hours, you can reach Luxembourg, Amsterdam, Esch-sur-Alzette, Antwerpen, Gent, Dudelange, Schifflange, Utrecht, Bettembourg, Stuttgart...