Here are a few suggestions for your next trip from Northeim(Han)

In 3 hours, you can reach Berlin, Hamburg, Frankfurt am Main, Dortmund, Bremen, Nürnberg.

In 4 hours, you can reach Köln, Stuttgart, Strasbourg, Düsseldorf, Essen, Enschede.

In 5 hours, you can reach Basel, Munich, Utrecht, Liège, Dresden, Arnhem.

In 6 hours, you can reach Brussels, Amsterdam, Rotterdam, Linz, The Hague, Groningen, Poznań, Anderlecht, Eindhoven, Tilburg...