Here are a few suggestions for your next trip from Mainz

In 4 hours, you can reach Paris, Brussels, Luxembourg, Esch-sur-Alzette.

In 5 hours, you can reach Berlin, Amsterdam, Zürich, Hamburg, Rotterdam, Antwerp.

In 6 hours, you can reach Schaan, Vaduz.

In 7 hours, you can reach London, Geneva.

In 8 hours, you can reach Vienna, Prague, Milan, Marseille.

In 9 hours, you can reach Bratislava, Birmingham, Brno.

In 10+ hours, you can reach Madrid, Rome, Bucharest, Budapest, Warsaw, Stockholm, Copenhagen, Dublin, Zagreb, Ljubljana...