Built between 1856 and 1862 for the Duke and Duchess of Treviso, this castle, made of brick and stone, now houses the permanent collections of the Museum of the Administrative Domain of Su. The castle was originally a country house with a huge outdoor garden. Today, the castle, with its ancient design and huge stones, is one of the country's most important museums, as it includes different and distinguished art collections, and collectibles are unique in Europe.