Declared a National Monument in 1902, the Ducal Castle of Torremaggiore (11th-16th century) has developed over the years around the original central square tower dating back to the Norman-Swabian period and built on one of the highest points in the area as a fortified structure. The structure has undergone various transformations over the centuries, especially at the hands of the Princes de Sangro, until it assumed its current Renaissance appearance. The Castle has six towers (on the central square one, the oldest, there is a sundial visible from the internal courtyard) and a moat bordered by a surrounding wall. In ancient times the Castle was connected to the facing Teatro Ducale by an elevated passage of which some traces are still visible. On January 30, 1710, the scientist and alchemist Raimondo di Sangro was born in the Castle. It currently houses the Civic Museum and houses the works of the local sculptor Giacomo Negri (1900-1973).