<prompt> Translate the following text to EnglishNgome ya matofali ya Cetello Sforzesco, iliyoko kaskazini magharibi mwa jiji, ilijengwa na Visconti na baadaye ilijengwa upya katika fomu yake ya sasa katika karne ya 15 na Duke Francesco Sforza.  <response>: The massive brick fortress, the Cetello Sforzesco, northwest of the city center, was originally built by the Visconti and later rebuilt in its present form in the 15th century by Duke Francesco Sforza. 