Eppstein is a town in the Main-Taunus-Kreis, in Hesse, Germany. Eppstein lies west of Frankfurt am Main, around 12 km north east of the state …Eppstein is a town in the Main-Taunus-Kreis, in Hesse, Germany. Eppstein lies west of Frankfurt am Main, around 12 km north east of the state capital Wiesbaden, and is at the edge of the Taunus mountains. The ruins of the Eppstein castle is a prominent landmark, and houses a museum.