The fourth floor consists of the library, a room used for temporary exhibitions related with Napoléon, and the terrace that is nicely covered with blue tiles.

The library proves the craftmanship of the Cuban cabinetmakers. It is made of mahogany and contains about 4.000 books from the 16th to 19th century. The ceiling in Cuban cedar looks rather elegant.

The bronze bust of the Emperor that stands in a niche in the center of the library is the work of Colombo. In 1812, it was cast in bronze in different sizes. The artist represented Napoléon as a strong figure. This bust serves as the emblem of the International Napoléonic Society.

From the terrace you will get one of the most pleasant views of a city part that extends  from the sea to the Revolution Square, including also the central garden of the museum.