The Civic Library is characterized by the splendid globe, that has a diameter of 2 metres, designed in 1713 by the cartographer Silvestro Amanzio Moroncelli.
The majestic room conserves the library's oldest collection, composed of about 16.000 volumes, mainly of the 16th century, deriving mostly from donations of Romolo Spezioli, of Fermo, who was Queen Christine of Sweden's doctor of confidence.