Liebenstein Castle (Thuringia)

Liebenstein Castle () is a castle in Liebenstein in the Ilm-Kreis, Thuringia, Germany. It was originally built in the 12th century by the counts of Käfernburg; the castellans were the counts' "ministeriales", the lords of Liebenstein.
The castle was extensively reconstructed in the 16th century, and subsequently used as a quarry for building-stone.