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

In 3 hours, you can reach Berlin.

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

In 5 hours, you can reach Munich, Frankfurt am Main, Ústí nad Labem, Essen, Dortmund, Bremen.

In 6 hours, you can reach Prague, Köln, Poznań, Liberec, Stuttgart, Düsseldorf, Szczecin, Enschede, Most.

In 7 hours, you can reach Amsterdam, Utrecht, Wrocław, Liège, Strasbourg, Salzburg, Innsbruck, Kolding, Nijmegen, Arnhem.

In 8 hours, you can reach Brussels.