Burg Rheinstein castle, along the river Rhine near Trechtingshausen, opposite bank of Assmannshausen.
Built in the 14th century, here is A Wikipedia page with its history, nowadays a private property.
Cropped 16:9 aspect ratio, taken while cruising a boat on the river. A direct light above, had to be processed on this picture.
A WS with the Sooneck-castle, located between the Burg Rheinstein castle and Bachrach.
Location along the Rhine: 49.9935, 7.8581