The Protestant castle church, formerly St. Wigbert's, is part of one of the best-preserved church fortifications in southern and western Germany. The Romanesque church tower from the early 12th century, with its late Gothic battlements and oriel turret, dominates the three-aisled church building. Its varying roof heights also reflect the various construction phases of the first half of the 15th century. The fortified west front with its large tracery window was completed in 1450.
Inside, the choir still contains many elements of the pre-Reformation period. A colorful stained glass window depicts the Adoration of the Magi, the Coronation of the Virgin Mary, and saints. It is a unique example of stained glass on the Middle Rhine around 1400. The late Gothic vaults are decorated with magnificent keystones and painted floral ornaments.
Many tombstones testify to the wealth, influence, and self-confidence of the former local aristocratic families. The facade of a silent organ with rich carvings dates back to the 18th century.