Here are a few suggestions for your next trip from Grötzingen

In 2 hours, you can reach Strasbourg, Basel, Frankfurt am Main, Stuttgart.

In 3 hours, you can reach Luxembourg, Paris, Dudelange, Köln, Schifflange, Bettembourg, Düsseldorf, Merl, Strassen, Bertrange...

In 4 hours, you can reach Zürich, Esch-sur-Alzette, Munich, Bern, Liège, Pétange, Winterthur, Luzern, Ettelbruck, Essen...