Here are a few suggestions for your next trip from Gernrode(Harz)

In 4 hours, you can reach Berlin, Dresden, Nürnberg.

In 5 hours, you can reach Hamburg, Frankfurt am Main, Bremen.

In 6 hours, you can reach Munich, Liberec, Szczecin, Ústí nad Labem, Essen, Dortmund.

In 7 hours, you can reach Prague, Köln, Poznań, Stuttgart, Düsseldorf, Salzburg, Strasbourg, Enschede, Most, Arnhem.

In 8 hours, you can reach Amsterdam, Basel, Linz, Wrocław, Utrecht, Liège, Bydgoszcz, Almere Stad.