Stolzenfels Castle is a former fortress located in Koblenz, Germany. It was originally built in the 13th century and served as a stronghold during various conflicts throughout history. The castle was destroyed during the late 17th century, but was rebuilt in the 19th century in the Gothic Revival style under the commission of King Frederick William IV of Prussia.

Today, Stolzenfels Castle is a popular tourist destination and is open to the public for guided tours. Visitors can explore the castle's many rooms, including the royal apartments, banquet hall, and library, which features a collection of rare books and manuscripts. The castle's gardens are also a major attraction, with terraced gardens, fountains, and beautiful views of the Rhine River.

Stolzenfels Castle has been designated as a cultural heritage site by UNESCO and is considered to be one of the most important examples of Gothic Revival architecture in Germany.