Here are a few suggestions for your next trip from Mengen

In 2 hours, you can reach Meßkirch, Tübingen-Derendingen, Ravensburg, Ulm Hbf, Blaustein, Bad Schussenried, Biberach(Riß) Süd, Biberach(Riß), Schemmerberg, Laupheim West...

In 3 hours, you can reach Stuttgart, Ulm Ost.

In 5 hours, you can reach Hechingen Landesbahn.

In 9 hours, you can reach Hermentingen, Jungnau, Hanfertal, Veringendorf, Veringenstadt, Gammertingen, Donaueschingen Aufen, Donaueschingen Mitte/Siedlung, Brigachtal Klengen, Brigachtal Kirchdorf...