The Castello dell'Imperatore is a medieval castle located in the city of Prato, Italy. Built in the 13th century, it was commissioned by the Holy Roman Emperor Frederick II. The castle features a rectangular layout with robust walls and four corner towers, showcasing the architectural style of the time. Today, the castle serves as a historical monument and cultural site, attracting visitors interested in medieval history. It houses exhibitions and events that highlight the rich heritage of Prato and the surrounding region, making it an important landmark in Tuscany.