The Braunfels Castle is located on a basalt hilltop to the west of the climatic health resort of Braunfels in the Lahn-Dill district in central Hesse. It has been the seat of the Counts of Solms since the 13th century and is still owned by the Counts of Oppersdorff zu Solms-Braunfels in the 21st century.

Braunfels Castle dominates the landscape far into the Lahn Valley and can be seen as a scenic and cultural-historical counterpart to Schaumburg Castle in the lower Lahn Valley. The expansion and conversion at the end of the 19th century belongs to a phase of creative historicism in neo-Gothic elements, in which one's own forms were consciously used. As one of the most important historicist castle conversions, Braunfels is of great national importance.