Here are a few suggestions for your next trip from Karlovy Vary

In 4 hours, you can reach Prag.

In 5 hours, you can reach München.

In 6 hours, you can reach Berlin, Linz.

In 7 hours, you can reach Wien, Brünn, Ostrava.

In 8 hours, you can reach Bratislava, Hamburg.

In 9 hours, you can reach Brüssel, Zürich, Schaan, Basel.

In 10+ hours, you can reach Rom, Paris, Bukarest, Budapest, Warschau, Stockholm, Kopenhagen, Amsterdam, Zagreb, Laibach...